diff --git a/libraries/classes/Config.php b/libraries/classes/Config.php
index 4ba9cbdb9a0a..3ddb793e1a6a 100644
--- a/libraries/classes/Config.php
+++ b/libraries/classes/Config.php
@@ -1673,7 +1673,7 @@ public function getTempDir(string $name): ?string
         if (empty($path)) {
             $path = null;
         } else {
-            $path .= '/' . $name;
+            $path = rtrim($path, '/') . '/' . $name;
             if (! @is_dir($path)) {
                 @mkdir($path, 0770, true);
             }