diff --git a/binding-mri/audio-binding.cpp b/binding-mri/audio-binding.cpp
index 4fa35bb..5f57768 100644
--- a/binding-mri/audio-binding.cpp
+++ b/binding-mri/audio-binding.cpp
@@ -31,7 +31,7 @@
 		const char *filename; \
 		int volume = 100; \
 		int pitch = 100; \
-		rb_get_args(argc, argv, "z|ii", &filename, &volume, &pitch); \
+		rb_get_args(argc, argv, "z|ii", &filename, &volume, &pitch, RB_ARG_END); \
 		GUARD_EXC( gState->audio().entity##Play(filename, volume, pitch); ) \
 		return Qnil; \
 	} \
@@ -47,7 +47,7 @@ RB_METHOD(audio_##entity##Fade) \
 { \
 	RB_UNUSED_PARAM; \
 	int time; \
-	rb_get_args(argc, argv, "i", &time); \
+	rb_get_args(argc, argv, "i", &time, RB_ARG_END); \
 	gState->audio().bgmFade(time); \
 	return Qnil; \
 }
diff --git a/binding-mri/binding-util.cpp b/binding-mri/binding-util.cpp
index cdd1d95..f249034 100644
--- a/binding-mri/binding-util.cpp
+++ b/binding-mri/binding-util.cpp
@@ -282,10 +282,51 @@ rb_get_args(int argc, VALUE *argv, const char *format, ...)
 		}
 	}
 
+	/* Pop remaining arg pointers off
+	 * the stack to check for RB_ARG_END */
+	format--;
+
+	while ((c = *format++))
+	{
+		switch (c)
+		{
+		case 'o' :
+		case 'S' :
+			va_arg(ap, VALUE*);
+			break;
+
+		case 's' :
+			va_arg(ap, const char**);
+			va_arg(ap, int*);
+			break;
+
+		case 'z' :
+			va_arg(ap, const char**);
+			break;
+
+		case 'f' :
+			va_arg(ap, double*);
+			break;
+
+		case 'i' :
+			va_arg(ap, int*);
+			break;
+
+		case 'b' :
+			va_arg(ap, bool*);
+			break;
+		}
+	}
+
 	// FIXME print num of needed args vs provided
 	if (!c && argc > argI)
 		rb_raise(rb_eArgError, "wrong number of arguments");
 
+	/* Verify correct termination */
+	void *argEnd = va_arg(ap, void*);
+	Q_UNUSED(argEnd);
+	Q_ASSERT(argEnd == RB_ARG_END);
+
 	va_end(ap);
 
 	return argI;
diff --git a/binding-mri/binding-util.h b/binding-mri/binding-util.h
index 0adcd4b..9a6b3d9 100644
--- a/binding-mri/binding-util.h
+++ b/binding-mri/binding-util.h
@@ -69,7 +69,7 @@ void initType(rb_data_type_struct &type,
               void (*freeInst)(void*));
 
 template<class C>
-static inline void freeInstance(void *inst)
+static void freeInstance(void *inst)
 {
 	delete static_cast<C*>(inst);
 }
@@ -132,6 +132,9 @@ wrapNilProperty(VALUE self, const char *iv)
 int
 rb_get_args(int argc, VALUE *argv, const char *format, ...);
 
+/* Always terminate 'rb_get_args' with this */
+#define RB_ARG_END ((void*) -1)
+
 typedef VALUE (*RubyMethod)(int argc, VALUE *argv, VALUE self);
 
 static inline void
@@ -158,7 +161,7 @@ objectLoad(int argc, VALUE *argv, VALUE self, rb_data_type_struct &type)
 {
 	const char *data;
 	int dataLen;
-	rb_get_args(argc, argv, "s", &data, &dataLen);
+	rb_get_args(argc, argv, "s", &data, &dataLen, RB_ARG_END);
 
 	VALUE obj = rb_obj_alloc(self);
 
@@ -227,7 +230,7 @@ rb_bool_new(bool value)
 		Klass *k = getPrivateData<Klass>(self); \
 		VALUE propObj; \
 		PropKlass *prop; \
-		rb_get_args(argc, argv, "o", &propObj); \
+		rb_get_args(argc, argv, "o", &propObj, RB_ARG_END); \
 		prop = getPrivateDataCheck<PropKlass>(propObj, PropKlass##Type); \
 		GUARD_EXC( k->set##PropName(prop); ) \
 		rb_iv_set(self, prop_iv, propObj); \
@@ -249,7 +252,7 @@ rb_bool_new(bool value)
 		Klass *k = getPrivateData<Klass>(self); \
 		VALUE propObj; \
 		PropKlass *prop; \
-		rb_get_args(argc, argv, "o", &propObj); \
+		rb_get_args(argc, argv, "o", &propObj, RB_ARG_END); \
 		if (rb_type(propObj) == RUBY_T_NIL) \
 			prop = 0; \
 		else \
@@ -271,7 +274,7 @@ rb_bool_new(bool value)
 	{ \
 		Klass *k = getPrivateData<Klass>(self); \
 		type value; \
-		rb_get_args(argc, argv, param_t_s, &value); \
+		rb_get_args(argc, argv, param_t_s, &value, RB_ARG_END); \
 		GUARD_EXC( k->set##PropName(value); ) \
 		return value_fun(value); \
 	}
diff --git a/binding-mri/bitmap-binding.cpp b/binding-mri/bitmap-binding.cpp
index b864f3b..7243608 100644
--- a/binding-mri/bitmap-binding.cpp
+++ b/binding-mri/bitmap-binding.cpp
@@ -39,14 +39,14 @@ RB_METHOD(bitmapInitialize)
 	if (argc == 1)
 	{
 		char *filename;
-		rb_get_args(argc, argv, "z", &filename);
+		rb_get_args(argc, argv, "z", &filename, RB_ARG_END);
 
 		GUARD_EXC( b = new Bitmap(filename); )
 	}
 	else
 	{
 		int width, height;
-		rb_get_args(argc, argv, "ii", &width, &height);
+		rb_get_args(argc, argv, "ii", &width, &height, RB_ARG_END);
 
 		GUARD_EXC( b = new Bitmap(width, height); )
 	}
@@ -114,7 +114,7 @@ RB_METHOD(bitmapBlt)
 	Bitmap *src;
 	Rect *srcRect;
 
-	rb_get_args(argc, argv, "iioo|i", &x, &y, &srcObj, &srcRectObj, &opacity);
+	rb_get_args(argc, argv, "iioo|i", &x, &y, &srcObj, &srcRectObj, &opacity, RB_ARG_END);
 
 	src = getPrivateDataCheck<Bitmap>(srcObj, BitmapType);
 	srcRect = getPrivateDataCheck<Rect>(srcRectObj, RectType);
@@ -136,7 +136,7 @@ RB_METHOD(bitmapStretchBlt)
 	Bitmap *src;
 	Rect *destRect, *srcRect;
 
-	rb_get_args(argc, argv, "ooo|i", &destRectObj, &srcObj, &srcRectObj);
+	rb_get_args(argc, argv, "ooo|i", &destRectObj, &srcObj, &srcRectObj, &opacity, RB_ARG_END);
 
 	src = getPrivateDataCheck<Bitmap>(srcObj, BitmapType);
 	destRect = getPrivateDataCheck<Rect>(destRectObj, RectType);
@@ -159,7 +159,7 @@ RB_METHOD(bitmapFillRect)
 		VALUE rectObj;
 		Rect *rect;
 
-		rb_get_args(argc, argv, "oo", &rectObj, &colorObj);
+		rb_get_args(argc, argv, "oo", &rectObj, &colorObj, RB_ARG_END);
 
 		rect = getPrivateDataCheck<Rect>(rectObj, RectType);
 		color = getPrivateDataCheck<Color>(colorObj, ColorType);
@@ -170,7 +170,7 @@ RB_METHOD(bitmapFillRect)
 	{
 		int x, y, width, height;
 
-		rb_get_args(argc, argv, "iiiio", &x, &y, &width, &height, &colorObj);
+		rb_get_args(argc, argv, "iiiio", &x, &y, &width, &height, &colorObj, RB_ARG_END);
 
 		color = getPrivateDataCheck<Color>(colorObj, ColorType);
 
@@ -197,7 +197,7 @@ RB_METHOD(bitmapGetPixel)
 
 	int x, y;
 
-	rb_get_args(argc, argv, "ii", &x, &y);
+	rb_get_args(argc, argv, "ii", &x, &y, RB_ARG_END);
 
 	GUARD_EXC(
 		if (x < 0 || y < 0 || x >= b->width() || y >= b->height())
@@ -221,7 +221,7 @@ RB_METHOD(bitmapSetPixel)
 
 	Color *color;
 
-	rb_get_args(argc, argv, "iio", &x, &y, &colorObj);
+	rb_get_args(argc, argv, "iio", &x, &y, &colorObj, RB_ARG_END);
 
 	color = getPrivateDataCheck<Color>(colorObj, ColorType);
 
@@ -236,7 +236,7 @@ RB_METHOD(bitmapHueChange)
 
 	int hue;
 
-	rb_get_args(argc, argv, "i", &hue);
+	rb_get_args(argc, argv, "i", &hue, RB_ARG_END);
 
 	GUARD_EXC( b->hueChange(hue); );
 
@@ -255,7 +255,7 @@ RB_METHOD(bitmapDrawText)
 		VALUE rectObj;
 		Rect *rect;
 
-		rb_get_args(argc, argv, "oz|i", &rectObj, &str, &align);
+		rb_get_args(argc, argv, "oz|i", &rectObj, &str, &align, RB_ARG_END);
 
 		rect = getPrivateDataCheck<Rect>(rectObj, RectType);
 
@@ -265,7 +265,7 @@ RB_METHOD(bitmapDrawText)
 	{
 		int x, y, width, height;
 
-		rb_get_args(argc, argv, "iiiiz|i", &x, &y, &width, &height, &str, &align);
+		rb_get_args(argc, argv, "iiiiz|i", &x, &y, &width, &height, &str, &align, RB_ARG_END);
 
 		GUARD_EXC( b->drawText(x, y, width, height, str, align); );
 	}
@@ -279,7 +279,7 @@ RB_METHOD(bitmapTextSize)
 
 	const char *str;
 
-	rb_get_args(argc, argv, "z", &str);
+	rb_get_args(argc, argv, "z", &str, RB_ARG_END);
 
 	IntRect value;
 	GUARD_EXC( value = b->textSize(str); );
diff --git a/binding-mri/etc-binding.cpp b/binding-mri/etc-binding.cpp
index 1e83527..f57e3c7 100644
--- a/binding-mri/etc-binding.cpp
+++ b/binding-mri/etc-binding.cpp
@@ -40,7 +40,7 @@ DEF_TYPE(Rect);
 	{ \
 		Klass *p = getPrivateData<Klass>(self); \
 		arg_type arg; \
-		rb_get_args(argc, argv, arg_t_s, &arg); \
+		rb_get_args(argc, argv, arg_t_s, &arg, RB_ARG_END); \
 		p->set##Attr(arg); \
 		return *argv; \
 	}
@@ -69,7 +69,7 @@ ATTR_INT_RW(Rect, Height)
 		Klass *p = getPrivateData<Klass>(self); \
 		VALUE otherObj; \
 		Klass *other; \
-		rb_get_args(argc, argv, "o", &otherObj); \
+		rb_get_args(argc, argv, "o", &otherObj, RB_ARG_END); \
 		other = getPrivateDataCheck<Klass>(otherObj, Klass##Type); \
 		return rb_bool_new(*p == *other); \
 	}
@@ -82,7 +82,7 @@ EQUAL_FUN(Rect)
 	RB_METHOD(Klass##Initialize) \
 	{ \
 		param_type p1, p2, p3, p4 = last_param_def; \
-		rb_get_args(argc, argv, param_t_s, &p1, &p2, &p3, &p4); \
+		rb_get_args(argc, argv, param_t_s, &p1, &p2, &p3, &p4, RB_ARG_END); \
 		Klass *k = new Klass(p1, p2, p3, p4); \
 		setPrivateData(self, k, Klass##Type); \
 		return self; \
@@ -96,7 +96,7 @@ INIT_FUN(Rect, int, "iiii", 0)
 	RB_METHOD(Klass##Set) \
 	{ \
 		param_type p1, p2, p3, p4 = last_param_def; \
-		rb_get_args(argc, argv, param_t_s, &p1, &p2, &p3, &p4); \
+		rb_get_args(argc, argv, param_t_s, &p1, &p2, &p3, &p4, RB_ARG_END); \
 		Klass *k = getPrivateData<Klass>(self); \
 		k->set(p1, p2, p3, p4); \
 		return self; \
diff --git a/binding-mri/filesystem-binding.cpp b/binding-mri/filesystem-binding.cpp
index 99ca073..f463ad9 100644
--- a/binding-mri/filesystem-binding.cpp
+++ b/binding-mri/filesystem-binding.cpp
@@ -47,7 +47,7 @@ RB_METHOD(fileIntRead)
 {
 
 	int length = -1;
-	rb_get_args(argc, argv, "i", &length);
+	rb_get_args(argc, argv, "i", &length, RB_ARG_END);
 
 	SDL_RWops *ops = getPrivateData<SDL_RWops>(self);
 
@@ -129,7 +129,7 @@ RB_METHOD(kernelLoadData)
 	RB_UNUSED_PARAM;
 
 	const char *filename;
-	rb_get_args(argc, argv, "z", &filename);
+	rb_get_args(argc, argv, "z", &filename, RB_ARG_END);
 
 	return kernelLoadDataInt(filename);
 }
@@ -141,7 +141,7 @@ RB_METHOD(kernelSaveData)
 	VALUE obj;
 	VALUE filename;
 
-	rb_get_args(argc, argv, "oS", &obj, &filename);
+	rb_get_args(argc, argv, "oS", &obj, &filename, RB_ARG_END);
 
 	VALUE file = rb_funcall(rb_cFile, rb_intern("open"), 2, filename, rb_str_new_cstr("w"));
 
diff --git a/binding-mri/flashable-binding.h b/binding-mri/flashable-binding.h
index a78b0cd..26f7adc 100644
--- a/binding-mri/flashable-binding.h
+++ b/binding-mri/flashable-binding.h
@@ -36,7 +36,7 @@ RB_METHOD(flashableFlash)
 
 	Color *color;
 
-	rb_get_args(argc, argv, "oi", &colorObj, &duration);
+	rb_get_args(argc, argv, "oi", &colorObj, &duration, RB_ARG_END);
 
 	if (rb_type(colorObj) == RUBY_T_NIL)
 	{
diff --git a/binding-mri/font-binding.cpp b/binding-mri/font-binding.cpp
index d4114b8..2db688d 100644
--- a/binding-mri/font-binding.cpp
+++ b/binding-mri/font-binding.cpp
@@ -31,7 +31,7 @@ RB_METHOD(fontDoesExist)
 	RB_UNUSED_PARAM;
 
 	const char *name;
-	rb_get_args(argc, argv, "z", &name);
+	rb_get_args(argc, argv, "z", &name, RB_ARG_END);
 
 	return rb_bool_new(Font::doesExist(name));
 }
@@ -41,7 +41,7 @@ RB_METHOD(fontInitialize)
 	const char *name = 0;
 	int size = 0;
 
-	rb_get_args(argc, argv, "|zi", &name, &size);
+	rb_get_args(argc, argv, "|zi", &name, &size, RB_ARG_END);
 
 	Font *f = new Font(name, size);
 
@@ -68,7 +68,7 @@ RB_METHOD(FontSetName)
 	Font *f = getPrivateData<Font>(self);
 
 	VALUE name;
-	rb_get_args(argc, argv, "S", &name);
+	rb_get_args(argc, argv, "S", &name, RB_ARG_END);
 
 	f->setName(RSTRING_PTR(name));
 
@@ -93,7 +93,7 @@ DEF_PROP_OBJ(Font, Color, Color, "color")
 	{ \
 		RB_UNUSED_PARAM; \
 		type value; \
-		rb_get_args(argc, argv, param_t_s, &value); \
+		rb_get_args(argc, argv, param_t_s, &value, RB_ARG_END); \
 		Klass::set##PropName(value); \
 		return value_fun(value); \
 	}
@@ -112,7 +112,7 @@ RB_METHOD(FontSetDefaultName)
 {
 	RB_UNUSED_PARAM;
 	VALUE nameObj;
-	rb_get_args(argc, argv, "S", &nameObj);
+	rb_get_args(argc, argv, "S", &nameObj, RB_ARG_END);
 
 	Font::setDefaultName(RSTRING_PTR(nameObj));
 
@@ -129,7 +129,7 @@ RB_METHOD(FontGetDefaultColor)
 RB_METHOD(FontSetDefaultColor)
 {
 	VALUE colorObj;
-	rb_get_args(argc, argv, "o", &colorObj);
+	rb_get_args(argc, argv, "o", &colorObj, RB_ARG_END);
 
 	Color *c = getPrivateDataCheck<Color>(colorObj, ColorType);
 
diff --git a/binding-mri/graphics-binding.cpp b/binding-mri/graphics-binding.cpp
index 9df69eb..7ebe441 100644
--- a/binding-mri/graphics-binding.cpp
+++ b/binding-mri/graphics-binding.cpp
@@ -50,7 +50,7 @@ RB_METHOD(graphicsTransition)
 	const char *filename = 0;
 	int vague = 40;
 
-	rb_get_args(argc, argv, "|izi", &duration, &filename, &vague);
+	rb_get_args(argc, argv, "|izi", &duration, &filename, &vague, RB_ARG_END);
 
 	GUARD_EXC( gState->graphics().transition(duration, filename, vague); )
 
@@ -76,7 +76,7 @@ RB_METHOD(graphicsFrameReset)
 	{ \
 		RB_UNUSED_PARAM; \
 		int value; \
-		rb_get_args(argc, argv, "i", &value); \
+		rb_get_args(argc, argv, "i", &value, RB_ARG_END); \
 		gState->graphics().set##PropName(value); \
 		return rb_fix_new(value); \
 	}
@@ -91,7 +91,7 @@ RB_METHOD(graphicsFrameReset)
 	{ \
 		RB_UNUSED_PARAM; \
 		bool value; \
-		rb_get_args(argc, argv, "b", &value); \
+		rb_get_args(argc, argv, "b", &value, RB_ARG_END); \
 		gState->graphics().set##PropName(value); \
 		return rb_bool_new(value); \
 	}
diff --git a/binding-mri/input-binding.cpp b/binding-mri/input-binding.cpp
index 053111e..3a07bf6 100644
--- a/binding-mri/input-binding.cpp
+++ b/binding-mri/input-binding.cpp
@@ -38,7 +38,7 @@ RB_METHOD(inputPress)
 	RB_UNUSED_PARAM;
 
 	int num;
-	rb_get_args(argc, argv, "i", &num);
+	rb_get_args(argc, argv, "i", &num, RB_ARG_END);
 
 	Input::ButtonCode bc = (Input::ButtonCode) num;
 
@@ -50,7 +50,7 @@ RB_METHOD(inputTrigger)
 	RB_UNUSED_PARAM;
 
 	int num;
-	rb_get_args(argc, argv, "i", &num);
+	rb_get_args(argc, argv, "i", &num, RB_ARG_END);
 
 	Input::ButtonCode bc = (Input::ButtonCode) num;
 
@@ -62,7 +62,7 @@ RB_METHOD(inputRepeat)
 	RB_UNUSED_PARAM;
 
 	int num;
-	rb_get_args(argc, argv, "i", &num);
+	rb_get_args(argc, argv, "i", &num, RB_ARG_END);
 
 	Input::ButtonCode bc = (Input::ButtonCode) num;
 
diff --git a/binding-mri/sceneelement-binding.h b/binding-mri/sceneelement-binding.h
index 8f5a5f9..789764a 100644
--- a/binding-mri/sceneelement-binding.h
+++ b/binding-mri/sceneelement-binding.h
@@ -44,7 +44,7 @@ RB_METHOD(sceneElementSetZ)
 	SceneElement *se = getPrivateData<C>(self);
 
 	int z;
-	rb_get_args(argc, argv, "i", &z);
+	rb_get_args(argc, argv, "i", &z, RB_ARG_END);
 
 	GUARD_EXC( se->setZ(z); );
 
@@ -70,7 +70,7 @@ RB_METHOD(sceneElementSetVisible)
 	SceneElement *se = getPrivateData<C>(self);
 
 	bool visible;
-	rb_get_args(argc, argv, "b", &visible);
+	rb_get_args(argc, argv, "b", &visible, RB_ARG_END);
 
 	GUARD_EXC( se->setVisible(visible); );
 
diff --git a/binding-mri/table-binding.cpp b/binding-mri/table-binding.cpp
index 224f56a..81152dd 100644
--- a/binding-mri/table-binding.cpp
+++ b/binding-mri/table-binding.cpp
@@ -30,7 +30,7 @@ RB_METHOD(tableInitialize)
 	int x, y, z;
 	x = y = z = 1;
 
-	rb_get_args(argc, argv, "i|ii", &x, &y, &z);
+	rb_get_args(argc, argv, "i|ii", &x, &y, &z, RB_ARG_END);
 
 	Table *t = new Table(x, y, z);
 
diff --git a/binding-mri/tilemap-binding.cpp b/binding-mri/tilemap-binding.cpp
index 85f898c..8a97f3f 100644
--- a/binding-mri/tilemap-binding.cpp
+++ b/binding-mri/tilemap-binding.cpp
@@ -37,7 +37,7 @@ RB_METHOD(tilemapAutotilesSet)
 	int i;
 	VALUE bitmapObj;
 
-	rb_get_args(argc, argv, "io", &i, &bitmapObj);
+	rb_get_args(argc, argv, "io", &i, &bitmapObj, RB_ARG_END);
 
 	Bitmap *bitmap = getPrivateDataCheck<Bitmap>(bitmapObj, BitmapType);
 
@@ -52,7 +52,7 @@ RB_METHOD(tilemapAutotilesSet)
 RB_METHOD(tilemapAutotilesGet)
 {
 	int i;
-	rb_get_args (argc, argv, "i", &i);
+	rb_get_args (argc, argv, "i", &i, RB_ARG_END);
 
 	if (i < 0 || i > 6)
 		return Qnil;
@@ -72,7 +72,7 @@ RB_METHOD(tilemapInitialize)
 	VALUE viewportObj = Qnil;
 	Viewport *viewport = 0;
 
-	rb_get_args(argc, argv, "|o", &viewportObj);
+	rb_get_args(argc, argv, "|o", &viewportObj, RB_ARG_END);
 
 	if (rb_type(viewportObj) != RUBY_T_NIL)
 		viewport = getPrivateDataCheck<Viewport>(viewportObj, ViewportType);
diff --git a/binding-mri/viewport-binding.cpp b/binding-mri/viewport-binding.cpp
index a450ae1..2406cc4 100644
--- a/binding-mri/viewport-binding.cpp
+++ b/binding-mri/viewport-binding.cpp
@@ -39,7 +39,7 @@ RB_METHOD(viewportInitialize)
 		VALUE rectObj;
 		Rect *rect;
 
-		rb_get_args(argc, argv, "o", &rectObj);
+		rb_get_args(argc, argv, "o", &rectObj, RB_ARG_END);
 
 		rect = getPrivateDataCheck<Rect>(rectObj, RectType);
 
@@ -49,7 +49,7 @@ RB_METHOD(viewportInitialize)
 	{
 		int x, y, width, height;
 
-		rb_get_args(argc, argv, "iiii", &x, &y, &width, &height);
+		rb_get_args(argc, argv, "iiii", &x, &y, &width, &height, RB_ARG_END);
 
 		v = new Viewport(x, y, width, height);
 	}
diff --git a/binding-mri/viewportelement-binding.h b/binding-mri/viewportelement-binding.h
index e262627..996c6df 100644
--- a/binding-mri/viewportelement-binding.h
+++ b/binding-mri/viewportelement-binding.h
@@ -48,7 +48,7 @@ viewportElementInitialize(int argc, VALUE *argv, VALUE self)
 	VALUE viewportObj = Qnil;
 	Viewport *viewport = 0;
 
-	rb_get_args(argc, argv, "|o", &viewportObj);
+	rb_get_args(argc, argv, "|o", &viewportObj, RB_ARG_END);
 
 	if (rb_type(viewportObj) != RUBY_T_NIL)
 		viewport = getPrivateDataCheck<Viewport>(viewportObj, ViewportType);