diff --git a/src/gl/data/gl_vertexbuffer.cpp b/src/gl/data/gl_vertexbuffer.cpp
index b18b367c37..4e76b51cb3 100644
--- a/src/gl/data/gl_vertexbuffer.cpp
+++ b/src/gl/data/gl_vertexbuffer.cpp
@@ -221,7 +221,7 @@ void FFlatVertexBuffer::OutputResized(int width, int height)
 	vbo_shadowdata[7].Set((float)width, (float)height, 0, 0, 0);
 	
 	Map();
-	memcpy(map, &vbo_shadowdata[4], 4 * sizeof(FFlatVertex));
+	memcpy(&map[4], &vbo_shadowdata[4], 4 * sizeof(FFlatVertex));
 	Unmap();
 }
 
diff --git a/src/gl/system/gl_framebuffer.cpp b/src/gl/system/gl_framebuffer.cpp
index 08aca521fd..6264352f6c 100644
--- a/src/gl/system/gl_framebuffer.cpp
+++ b/src/gl/system/gl_framebuffer.cpp
@@ -189,7 +189,9 @@ void OpenGLFrameBuffer::Update()
 		int clientHeight = GetClientHeight();
 		if (clientWidth > 0 && clientHeight > 0 && (Width != clientWidth || Height != clientHeight))
 		{
-			Resize(clientWidth, clientHeight);
+			// Do not call Resize here because it's only for software canvases
+			Pitch = Width = clientWidth;
+			Height = clientHeight;
 			V_OutputResized(Width, Height);
 			GLRenderer->mVBO->OutputResized(Width, Height);
 		}