diff --git a/reactos/win32ss/user/ntuser/message.c b/reactos/win32ss/user/ntuser/message.c
index 4162008a35e..50deea3e44c 100644
--- a/reactos/win32ss/user/ntuser/message.c
+++ b/reactos/win32ss/user/ntuser/message.c
@@ -1906,6 +1906,22 @@ IntUninitMessagePumpHook()
     return FALSE;
 }
 
+BOOL FASTCALL
+IntCallMsgFilter( LPMSG lpmsg, INT code)
+{
+    BOOL Ret = FALSE;
+
+    if ( co_HOOK_CallHooks( WH_SYSMSGFILTER, code, 0, (LPARAM)lpmsg))
+    {
+        Ret = TRUE;
+    }
+    else
+    {
+        Ret = co_HOOK_CallHooks( WH_MSGFILTER, code, 0, (LPARAM)lpmsg);
+    }
+    return Ret;
+}
+
 /** Functions ******************************************************************/
 
 BOOL
diff --git a/reactos/win32ss/user/ntuser/msgqueue.h b/reactos/win32ss/user/ntuser/msgqueue.h
index decf12301e0..e2882f84cbc 100644
--- a/reactos/win32ss/user/ntuser/msgqueue.h
+++ b/reactos/win32ss/user/ntuser/msgqueue.h
@@ -254,6 +254,7 @@ VOID FASTCALL IdlePong(VOID);
 BOOL FASTCALL co_MsqReplyMessage(LRESULT);
 VOID FASTCALL MsqWakeQueue(PTHREADINFO,DWORD,BOOL);
 VOID FASTCALL ClearMsgBitsMask(PTHREADINFO,UINT);
+BOOL FASTCALL IntCallMsgFilter(LPMSG,INT);
 
 int UserShowCursor(BOOL bShow);
 PCURICON_OBJECT