diff --git a/tosfs/core.py b/tosfs/core.py
index 5b75853..5ac18f3 100644
--- a/tosfs/core.py
+++ b/tosfs/core.py
@@ -526,7 +526,7 @@ def exists(self, path: str, **kwargs: Any) -> bool:
 
         try:
             return retryable_func_executor(
-                lambda: self.tos_client.head_object(bucket, key) or True,
+                lambda: self.tos_client.head_object(bucket, key) and True,
                 max_retry_num=self.max_retry_num,
             )
         except TosServerError as e:
@@ -536,7 +536,7 @@ def exists(self, path: str, **kwargs: Any) -> bool:
                         lambda: self.tos_client.head_object(
                             bucket, key.rstrip("/") + "/"
                         )
-                        or True,
+                        and True,
                         max_retry_num=self.max_retry_num,
                     )
                 except TosServerError as ex: