Index: /trunk/src/VBox/Additions/WINNT/Graphics/Video/disp/wddm/VBoxDispD3D.cpp
===================================================================
--- /trunk/src/VBox/Additions/WINNT/Graphics/Video/disp/wddm/VBoxDispD3D.cpp	(revision 57914)
+++ /trunk/src/VBox/Additions/WINNT/Graphics/Video/disp/wddm/VBoxDispD3D.cpp	(revision 57915)
@@ -223,5 +223,5 @@
 static D3DDDIQUERYTYPE gVBoxQueryTypes[] = {
         D3DDDIQUERYTYPE_EVENT,
-//        D3DDDIQUERYTYPE_OCCLUSION
+        D3DDDIQUERYTYPE_OCCLUSION
 };
 
@@ -5403,4 +5403,7 @@
         case D3DDDIQUERYTYPE_EVENT:
             Assert(cbData == sizeof (BOOL));
+            break;
+        case D3DDDIQUERYTYPE_OCCLUSION:
+            Assert(cbData == sizeof (UINT));
             break;
         default: