Index: /trunk/include/iprt/critsect.h
===================================================================
--- /trunk/include/iprt/critsect.h	(revision 51941)
+++ /trunk/include/iprt/critsect.h	(revision 51942)
@@ -30,5 +30,5 @@
 #include <iprt/types.h>
 #include <iprt/assert.h>
-#ifdef IN_RING3
+#if defined(IN_RING3) || defined(IN_RING0)
 # include <iprt/thread.h>
 #endif