diff --git a/system/Test/PhpStreamWrapper.php b/system/Test/PhpStreamWrapper.php
index 980d5424ab62..a6be8dd1329c 100644
--- a/system/Test/PhpStreamWrapper.php
+++ b/system/Test/PhpStreamWrapper.php
@@ -46,7 +46,7 @@ public static function restore()
         stream_wrapper_restore('php');
     }
 
-    public function stream_open(string $path): bool
+    public function stream_open(): bool
     {
         return true;
     }