diff --git a/src/gl-util.h b/src/gl-util.h
index ce7db54..8af4ac1 100644
--- a/src/gl-util.h
+++ b/src/gl-util.h
@@ -116,7 +116,7 @@ namespace Tex
 	}
 }
 
-namespace RB
+namespace RBO
 {
 	DEF_GL_ID
 
@@ -195,7 +195,7 @@ namespace FBO
 		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + colorAttach, GL_TEXTURE_2D, texTarget.gl, 0);
 	}
 
-	inline void setRBTarget(RB::ID rbTarget, unsigned colorAttach = 0)
+	inline void setRBOTarget(RBO::ID rbTarget, unsigned colorAttach = 0)
 	{
 		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + colorAttach, GL_RENDERBUFFER, rbTarget.gl);
 	}
@@ -348,40 +348,40 @@ struct TexFBO
 	}
 };
 
-struct RBFBO
+struct RBOFBO
 {
-	RB::ID rb;
+	RBO::ID rbo;
 	FBO::ID fbo;
 	int width, height;
 
-	RBFBO()
-	    : rb(0), fbo(0), width(0), height(0)
+	RBOFBO()
+	    : rbo(0), fbo(0), width(0), height(0)
 	{}
 
-	static inline void init(RBFBO &obj)
+	static inline void init(RBOFBO &obj)
 	{
-		obj.rb = RB::gen();
+		obj.rbo = RBO::gen();
 		obj.fbo = FBO::gen();
 	}
 
-	static inline void allocEmpty(RBFBO &obj, int width, int height)
+	static inline void allocEmpty(RBOFBO &obj, int width, int height)
 	{
-		RB::bind(obj.rb);
-		RB::allocEmpty(width, height);
+		RBO::bind(obj.rbo);
+		RBO::allocEmpty(width, height);
 		obj.width = width;
 		obj.height = height;
 	}
 
-	static inline void linkFBO(RBFBO &obj)
+	static inline void linkFBO(RBOFBO &obj)
 	{
 		FBO::bind(obj.fbo);
-		FBO::setRBTarget(obj.rb);
+		FBO::setRBOTarget(obj.rbo);
 	}
 
-	static inline void fini(RBFBO &obj)
+	static inline void fini(RBOFBO &obj)
 	{
 		FBO::del(obj.fbo);
-		RB::del(obj.rb);
+		RBO::del(obj.rbo);
 	}
 };
 
diff --git a/src/graphics.cpp b/src/graphics.cpp
index 09433e8..5c0c8f6 100644
--- a/src/graphics.cpp
+++ b/src/graphics.cpp
@@ -469,7 +469,7 @@ struct GraphicsPrivate
 	TexFBO frozenScene;
 	TexFBO currentScene;
 	Quad screenQuad;
-	RBFBO transBuffer;
+	RBOFBO transBuffer;
 
 	GraphicsPrivate()
 	    : scRes(640, 480),
@@ -494,9 +494,9 @@ struct GraphicsPrivate
 		FloatRect screenRect(0, 0, scRes.x, scRes.y);
 		screenQuad.setTexPosRect(screenRect, screenRect);
 
-		RBFBO::init(transBuffer);
-		RBFBO::allocEmpty(transBuffer, scRes.x, scRes.y);
-		RBFBO::linkFBO(transBuffer);
+		RBOFBO::init(transBuffer);
+		RBOFBO::allocEmpty(transBuffer, scRes.x, scRes.y);
+		RBOFBO::linkFBO(transBuffer);
 	}
 
 	~GraphicsPrivate()
@@ -504,7 +504,7 @@ struct GraphicsPrivate
 		TexFBO::fini(frozenScene);
 		TexFBO::fini(currentScene);
 
-		RBFBO::fini(transBuffer);
+		RBOFBO::fini(transBuffer);
 	}
 
 	void updateScreenResoRatio()
@@ -792,8 +792,8 @@ void Graphics::resizeScreen(int width, int height)
 	FloatRect screenRect(0, 0, width, height);
 	p->screenQuad.setTexPosRect(screenRect, screenRect);
 
-	RB::bind(p->transBuffer.rb);
-	RB::allocEmpty(width, height);
+	RBO::bind(p->transBuffer.rbo);
+	RBO::allocEmpty(width, height);
 
 	p->updateScreenResoRatio();
 }