diff --git a/desmume/src/OGLRender.cpp b/desmume/src/OGLRender.cpp
index 8d72744f3..d21d57ad5 100755
--- a/desmume/src/OGLRender.cpp
+++ b/desmume/src/OGLRender.cpp
@@ -2265,6 +2265,7 @@ Render3DError OpenGLRenderer_1_2::CreatePBOs()
 	glGenBuffersARB(1, &OGLRef.pboRenderDataID);
 	glBindBufferARB(GL_PIXEL_PACK_BUFFER_ARB, OGLRef.pboRenderDataID);
 	glBufferDataARB(GL_PIXEL_PACK_BUFFER_ARB, this->_framebufferColorSizeBytes, NULL, GL_STREAM_READ_ARB);
+	this->_mappedFramebuffer = (FragmentColor *__restrict)glMapBuffer(GL_PIXEL_PACK_BUFFER_ARB, GL_READ_ONLY_ARB);
 	
 	return OGLERROR_NOERR;
 }
diff --git a/desmume/src/render3D.cpp b/desmume/src/render3D.cpp
old mode 100644
new mode 100755
index f4231f769..f00ef1588
--- a/desmume/src/render3D.cpp
+++ b/desmume/src/render3D.cpp
@@ -209,7 +209,7 @@ Render3D::Render3D()
 	_framebufferHeight = GPU_FRAMEBUFFER_NATIVE_HEIGHT;
 	_framebufferPixCount = _framebufferWidth * _framebufferHeight;
 	_framebufferSIMDPixCount = 0;
-	_framebufferColorSizeBytes = 0;
+	_framebufferColorSizeBytes = _framebufferWidth * _framebufferHeight * sizeof(FragmentColor);
 	_framebufferColor = NULL;
 	
 	_internalRenderingFormat = NDSColorFormat_BGR666_Rev;