diff --git a/code/nel/src/3d/driver/OpenGL3/driver_opengl.h b/code/nel/src/3d/driver/OpenGL3/driver_opengl.h
index acd71fa64..49fb89354 100644
--- a/code/nel/src/3d/driver/OpenGL3/driver_opengl.h
+++ b/code/nel/src/3d/driver/OpenGL3/driver_opengl.h
@@ -332,8 +332,8 @@ public:
 	virtual bool			copyTextToClipboard(const ucstring &text);
 	virtual bool			pasteTextFromClipboard(ucstring &text);
 
-	uint32 getAvailableVertexAGPMemory (){ return 0; };
-	uint32 getAvailableVertexVRAMMemory (){ return 0; };
+	uint32 getAvailableVertexAGPMemory (){ return uint32( -1 ); };
+	uint32 getAvailableVertexVRAMMemory (){ return uint32( -1 ); };
 
 	virtual emptyProc		getWindowProc();