Index: /trunk/include/VBox/dbggui.h
===================================================================
--- /trunk/include/VBox/dbggui.h	(revision 55007)
+++ /trunk/include/VBox/dbggui.h	(revision 55008)
@@ -36,5 +36,9 @@
  */
 
+#ifdef RT_OS_WINDOWS
+struct ISession;
+#else
 class ISession;
+#endif
 
 /** Pointer to the debugger GUI instance structure. */