diff --git a/compat/mingw.c b/compat/mingw.c
index 4626f98e522058..c077bfb9a48043 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1276,8 +1276,11 @@ char *mingw_mktemp(char *template)
 	int offset = 0;
 
 	/* we need to return the path, thus no long paths here! */
-	if (xutftowcs_path(wtemplate, template) < 0)
+	if (xutftowcsn(wtemplate, template, MAX_PATH, -1) < 0) {
+		if (errno == ERANGE)
+			errno = ENAMETOOLONG;
 		return NULL;
+	}
 
 	if (is_dir_sep(template[0]) && !is_dir_sep(template[1]) &&
 	    iswalpha(wtemplate[0]) && wtemplate[1] == L':') {