diff --git a/src/Pool.php b/src/Pool.php
index 320562a..4bd650f 100644
--- a/src/Pool.php
+++ b/src/Pool.php
@@ -241,8 +241,7 @@ public function offsetExists($offset): bool
         return false;
     }
 
-    #[\ReturnTypeWillChange]
-    public function offsetGet($offset)
+    public function offsetGet($offset): Runnable
     {
         // TODO
     }