diff --git a/include/mssip.h b/include/mssip.h
index 4f00226713a..4aa2fa4e576 100644
--- a/include/mssip.h
+++ b/include/mssip.h
@@ -168,6 +168,7 @@ BOOL WINAPI CryptSIPVerifyIndirectData(SIP_SUBJECTINFO *,SIP_INDIRECT_DATA *);
 BOOL WINAPI CryptSIPRemoveSignedDataMsg(SIP_SUBJECTINFO *,DWORD);
 
 BOOL WINAPI CryptSIPLoad(const GUID *,DWORD,SIP_DISPATCH_INFO *);
+BOOL WINAPI CryptSIPRetrieveSubjectGuid(LPCWSTR,HANDLE,GUID *);
 BOOL WINAPI CryptSIPRetrieveSubjectGuidForCatalogFile(LPCWSTR,HANDLE,GUID *);
 BOOL WINAPI CryptSIPAddProvider(SIP_ADD_NEWPROVIDER *);
 BOOL WINAPI CryptSIPRemoveProvider(GUID *);