diff --git a/gfx/thebes/gfxWindowsPlatform.cpp b/gfx/thebes/gfxWindowsPlatform.cpp
index b6c6c16839c..ed4113be91f 100755
--- a/gfx/thebes/gfxWindowsPlatform.cpp
+++ b/gfx/thebes/gfxWindowsPlatform.cpp
@@ -194,7 +194,7 @@ public:
         IDXGIAdapter *DXGIAdapter;
 
         HMODULE gdi32Handle;
-        PFND3DKMTQS queryD3DKMTStatistics;
+        PFND3DKMTQS queryD3DKMTStatistics = nullptr;
 
         // GPU memory reporting is not available before Windows 7
         if (!IsWin7OrLater())