diff --git a/egs/librispeech/ASR/zipformer/zipformer.py b/egs/librispeech/ASR/zipformer/zipformer.py
index 2226329da..1edf2eff4 100644
--- a/egs/librispeech/ASR/zipformer/zipformer.py
+++ b/egs/librispeech/ASR/zipformer/zipformer.py
@@ -2459,4 +2459,5 @@ if __name__ == "__main__":
     torch.set_num_threads(1)
     torch.set_num_interop_threads(1)
     _test_zipformer_main(False)
-    _test_zipformer_main(True)
\ No newline at end of file
+    _test_zipformer_main(True)
+