diff --git a/src/glstate.cpp b/src/glstate.cpp
index 0fbcdc6..a4b4d09 100644
--- a/src/glstate.cpp
+++ b/src/glstate.cpp
@@ -119,7 +119,7 @@ GLState::GLState(const Config &conf)
 	blendMode.init(BlendNormal);
 	blend.init(true);
 	scissorTest.init(false);
-	scissorBox.init(IntRect(0, 0, 640, 480));
+	scissorBox.init(IntRect());
 	program.init(0);
 
 	if (conf.maxTextureSize > 0)
diff --git a/src/graphics.cpp b/src/graphics.cpp
index f13f950..1322d23 100644
--- a/src/graphics.cpp
+++ b/src/graphics.cpp
@@ -152,6 +152,7 @@ public:
 		pp.startRender();
 
 		glState.viewport.set(IntRect(0, 0, w, h));
+		glState.scissorBox.pushSet(IntRect(0, 0, w, h));
 
 		FBO::clear();
 
@@ -166,6 +167,8 @@ public:
 
 			brightnessQuad.draw();
 		}
+
+		glState.scissorBox.pop();
 	}
 
 	void requestViewportRender(const Vec4 &c, const Vec4 &f, const Vec4 &t)