diff --git a/adminer/include/functions.inc.php b/adminer/include/functions.inc.php
index b4aeb6a9..4a3dd50b 100644
--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -685,7 +685,7 @@ function file_open_lock(string $filename) {
 	if (!$fp) {
 		return;
 	}
-	chmod($filename, 0660);
+	@chmod($filename, 0660); // @ - may not be permitted
 	if (!flock($fp, LOCK_EX)) {
 		fclose($fp);
 		return;