diff --git a/lib/System/Unix/Path.inc b/lib/System/Unix/Path.inc
index 15cbcab1b9a..b7afb8536d5 100644
--- a/lib/System/Unix/Path.inc
+++ b/lib/System/Unix/Path.inc
@@ -692,8 +692,7 @@ Path::createDirectoryOnDisk( bool create_parents, std::string* ErrMsg ) {
   pathname[lastchar] = '\0';
 
   if (createDirectoryHelper(&pathname[0], &pathname[lastchar], create_parents))
-    return MakeErrMsg(ErrMsg,
-                      std::string(pathname) + ": can't create directory");
+    return MakeErrMsg(ErrMsg, pathname + ": can't create directory");
 
   return false;
 }