diff --git a/include/msctf.idl b/include/msctf.idl
index 10580573e92..fc2a8da5fd6 100644
--- a/include/msctf.idl
+++ b/include/msctf.idl
@@ -29,6 +29,9 @@ cpp_quote("#define TF_E_DISCONNECTED    MAKE_HRESULT(SEVERITY_ERROR, FACILITY_IT
 cpp_quote("#define TF_E_ALREADY_EXISTS  MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0x0506)")
 cpp_quote("#define TF_E_NOLOCK          MAKE_HRESULT(SEVERITY_ERROR, FACILITY_ITF, 0x0201)")
 
+cpp_quote("HRESULT WINAPI TF_CreateThreadMgr(ITfThreadMgr **pptim);")
+cpp_quote("HRESULT WINAPI TF_GetThreadMgr(ITfThreadMgr **pptim);")
+
 cpp_quote("EXTERN_C const CLSID CLSID_TF_ThreadMgr;")
 cpp_quote("EXTERN_C const CLSID CLSID_TF_InputProcessorProfiles;")
 cpp_quote("EXTERN_C const CLSID CLSID_TF_CategoryMgr;")