Index: /trunk/include/VBox/vmm/pdmapi.h
===================================================================
--- /trunk/include/VBox/vmm/pdmapi.h	(revision 80531)
+++ /trunk/include/VBox/vmm/pdmapi.h	(revision 80532)
@@ -40,4 +40,7 @@
 #include <VBox/sup.h>
 
+#ifdef IN_RING0
+struct PDMDEVMODREGR0;
+#endif
 
 RT_C_DECLS_BEGIN