diff --git a/src/OpenGL/libEGL/Surface.cpp b/src/OpenGL/libEGL/Surface.cpp
index 8cb3b39..b3616b1 100644
--- a/src/OpenGL/libEGL/Surface.cpp
+++ b/src/OpenGL/libEGL/Surface.cpp
@@ -278,8 +278,7 @@
 		RECT client;
 		if(!GetClientRect(window, &client))
 		{
-			ASSERT(false);
-			return false;
+			return error(EGL_BAD_NATIVE_WINDOW, false);
 		}
 
 		int windowWidth = client.right - client.left;