diff --git a/gymnasium/vector/async_vector_env.py b/gymnasium/vector/async_vector_env.py
index 9bd28fb02..4fda67bbf 100644
--- a/gymnasium/vector/async_vector_env.py
+++ b/gymnasium/vector/async_vector_env.py
@@ -613,7 +613,7 @@ def _assert_is_running(self):
                 f"Trying to operate on `{type(self).__name__}`, after a call to `close()`."
             )
 
-    def _raise_if_errors(self, successes: list[bool]):
+    def _raise_if_errors(self, successes: list[bool] | tuple[bool]):
         if all(successes):
             return