diff --git a/src/gl/data/gl_viewpointbuffer.h b/src/gl/data/gl_viewpointbuffer.h
index 3ec1093df5..08c1cab0c9 100644
--- a/src/gl/data/gl_viewpointbuffer.h
+++ b/src/gl/data/gl_viewpointbuffer.h
@@ -14,7 +14,7 @@ class GLViewpointBuffer
 	void * mBufferPointer;
 	TArray<bool> mClipPlaneInfo;
 	
-	unsigned int m2DWidth = ~0u, m2DHeight = ~0u;
+	int m2DWidth = -1, m2DHeight = -1;
 
 	unsigned int mBlockSize;