diff --git a/src/OpenGl/OpenGl_Context.cxx b/src/OpenGl/OpenGl_Context.cxx
index d501804256..90de0f20cb 100644
--- a/src/OpenGl/OpenGl_Context.cxx
+++ b/src/OpenGl/OpenGl_Context.cxx
@@ -1818,7 +1818,7 @@ void OpenGl_Context::MemoryInfo (TColStd_IndexedDataMapOfStringString& theDict)
   if (myFuncs->glXQueryCurrentRendererIntegerMESA != NULL)
   {
     unsigned int aVMemMiB = 0;
-    if (myFuncs->glXQueryCurrentRendererIntegerMESA (GLX_RENDERER_VIDEO_MEMORY_MESA, &aVMemMiB) != False)
+    if (myFuncs->glXQueryCurrentRendererIntegerMESA (GLX_RENDERER_VIDEO_MEMORY_MESA, &aVMemMiB) != 0)
     {
       addInfo (theDict, "GPU memory", TCollection_AsciiString() + int(aVMemMiB) + " MiB");
     }