diff --git a/dlls/msi/msipriv.h b/dlls/msi/msipriv.h
index eaef4f5088..849252e850 100644
--- a/dlls/msi/msipriv.h
+++ b/dlls/msi/msipriv.h
@@ -362,7 +362,6 @@ extern INT MSI_ProcessMessage( MSIPACKAGE *, INSTALLMESSAGE, MSIRECORD * );
 extern UINT MSI_GetPropertyW( MSIPACKAGE *, LPCWSTR, LPWSTR, DWORD * );
 extern UINT MSI_GetPropertyA(MSIPACKAGE *, LPCSTR, LPSTR, DWORD* );
 extern MSICONDITION MSI_EvaluateConditionW( MSIPACKAGE *, LPCWSTR );
-extern UINT MSI_SetPropertyW( MSIPACKAGE *, LPCWSTR, LPCWSTR );
 extern UINT MSI_GetComponentStateW( MSIPACKAGE *, LPWSTR, INSTALLSTATE *, INSTALLSTATE * );
 extern UINT MSI_GetFeatureStateW( MSIPACKAGE *, LPWSTR, INSTALLSTATE *, INSTALLSTATE * );
 extern UINT WINAPI MSI_SetFeatureStateW(MSIPACKAGE*, LPCWSTR, INSTALLSTATE );