diff --git a/python/sglang/srt/managers/tokenizer_manager.py b/python/sglang/srt/managers/tokenizer_manager.py
index 1ac16f718c97..5fb83616022a 100644
--- a/python/sglang/srt/managers/tokenizer_manager.py
+++ b/python/sglang/srt/managers/tokenizer_manager.py
@@ -828,7 +828,7 @@ def _validate_one_request(
         if (
             self.validate_total_tokens
             and max_new_tokens is not None
-            and (max_new_tokens + input_token_num) >= _max_req_len
+            and (max_new_tokens + input_token_num) > _max_req_len
         ):
             if self.server_args.allow_auto_truncate:
                 logger.warning(