diff --git a/Utility/Su.hs b/Utility/Su.hs
index 464c8aaf51..f1afd54140 100644
--- a/Utility/Su.hs
+++ b/Utility/Su.hs
@@ -98,5 +98,5 @@ mkSuCommand cmd ps = firstM (\(SuCommand _ p _) -> inPath p) =<< selectcmds
 	shellcmd = unwords $ map shellEscape (cmd:toCommand ps)
 #else
 -- For windows, we assume the user has administrator access.
-mkSuCommand cmd ps = return $ SuCommand NoPromptPassword cmd ps
+mkSuCommand cmd ps = return $ Just $ SuCommand NoPromptPassword cmd ps
 #endif