Index: /trunk/src/VBox/GuestHost/OpenGL/include/cr_threads.h
===================================================================
--- /trunk/src/VBox/GuestHost/OpenGL/include/cr_threads.h	(revision 39577)
+++ /trunk/src/VBox/GuestHost/OpenGL/include/cr_threads.h	(revision 39578)
@@ -113,5 +113,5 @@
 
 #define CRTSDREFDATA \
-    volatile uint32_t cTsdRefs; \
+    volatile int32_t cTsdRefs; \
     uint32_t enmTsdRefState; \
     PFNCRTSDREFDTOR pfnTsdRefDtor; \