diff --git a/egs/gigaspeech/ASR/pruned_transducer_stateless2/decode.py b/egs/gigaspeech/ASR/pruned_transducer_stateless2/decode.py
index e5810749b..f36cc95f7 100755
--- a/egs/gigaspeech/ASR/pruned_transducer_stateless2/decode.py
+++ b/egs/gigaspeech/ASR/pruned_transducer_stateless2/decode.py
@@ -206,8 +206,8 @@ def post_processing(
 ) -> List[Tuple[List[str], List[str]]]:
     new_results = []
     for ref, hyp in results:
-        new_ref = asr_text_post_processing(' '.join(ref)).split()
-        new_hyp = asr_text_post_processing(' '.join(hyp)).split()
+        new_ref = asr_text_post_processing(" ".join(ref)).split()
+        new_hyp = asr_text_post_processing(" ".join(hyp)).split()
         new_results.append((new_ref, new_hyp))
     return new_results