diff --git a/dlls/msctf/threadmgr.c b/dlls/msctf/threadmgr.c
index 528414fcfda..aa838dade92 100644
--- a/dlls/msctf/threadmgr.c
+++ b/dlls/msctf/threadmgr.c
@@ -615,6 +615,12 @@ static HRESULT WINAPI ThreadMgrSource_AdviseSink(ITfSource *iface,
     if (IsEqualIID(riid, &IID_ITfThreadMgrEventSink))
         return advise_sink(&This->ThreadMgrEventSink, &IID_ITfThreadMgrEventSink, COOKIE_MAGIC_TMSINK, punk, pdwCookie);
 
+    if (IsEqualIID(riid, &IID_ITfThreadFocusSink))
+    {
+        WARN("semi-stub for ITfThreadFocusSink: sink won't be used.\n");
+        return advise_sink(&This->ThreadMgrEventSink, &IID_ITfThreadMgrEventSink, COOKIE_MAGIC_TMSINK, punk, pdwCookie);
+    }
+
     FIXME("(%p) Unhandled Sink: %s\n",This,debugstr_guid(riid));
     return E_NOTIMPL;
 }