diff --git a/egs/librispeech/ASR/pruned_transducer_stateless/decode.py b/egs/librispeech/ASR/pruned_transducer_stateless/decode.py
index ea011b1f9..f39cc614c 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless/decode.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless/decode.py
@@ -449,7 +449,7 @@ def decode_one_batch(
         key += f"max_contexts_{params.max_contexts}_"
         key += f"max_states_{params.max_states}"
         if "nbest" in params.decoding_method:
-            key += f"num_paths_{params.num_paths}_"
+            key += f"_num_paths_{params.num_paths}_"
             key += f"nbest_scale_{params.nbest_scale}"
             if "LG" in params.decoding_method:
                 key += f"_ngram_lm_scale_{params.ngram_lm_scale}"
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless2/decode.py b/egs/librispeech/ASR/pruned_transducer_stateless2/decode.py
index 56cfde8d2..ea368fb87 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless2/decode.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless2/decode.py
@@ -456,7 +456,7 @@ def decode_one_batch(
         key += f"max_contexts_{params.max_contexts}_"
         key += f"max_states_{params.max_states}"
         if "nbest" in params.decoding_method:
-            key += f"num_paths_{params.num_paths}_"
+            key += f"_num_paths_{params.num_paths}_"
             key += f"nbest_scale_{params.nbest_scale}"
             if "LG" in params.decoding_method:
                 key += f"_ngram_lm_scale_{params.ngram_lm_scale}"
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless3/decode.py b/egs/librispeech/ASR/pruned_transducer_stateless3/decode.py
index bb04c3378..8b1ddc930 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless3/decode.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless3/decode.py
@@ -465,7 +465,7 @@ def decode_one_batch(
         key += f"max_contexts_{params.max_contexts}_"
         key += f"max_states_{params.max_states}"
         if "nbest" in params.decoding_method:
-            key += f"num_paths_{params.num_paths}_"
+            key += f"_num_paths_{params.num_paths}_"
             key += f"nbest_scale_{params.nbest_scale}"
             if "LG" in params.decoding_method:
                 key += f"_ngram_lm_scale_{params.ngram_lm_scale}"
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless4/decode.py b/egs/librispeech/ASR/pruned_transducer_stateless4/decode.py
index 79dd7856e..a8d730ad6 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless4/decode.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless4/decode.py
@@ -462,7 +462,7 @@ def decode_one_batch(
         key += f"max_contexts_{params.max_contexts}_"
         key += f"max_states_{params.max_states}"
         if "nbest" in params.decoding_method:
-            key += f"num_paths_{params.num_paths}_"
+            key += f"_num_paths_{params.num_paths}_"
             key += f"nbest_scale_{params.nbest_scale}"
             if "LG" in params.decoding_method:
                 key += f"_ngram_lm_scale_{params.ngram_lm_scale}"
diff --git a/egs/librispeech/ASR/pruned_transducer_stateless5/decode.py b/egs/librispeech/ASR/pruned_transducer_stateless5/decode.py
index d845eed51..f87d23cc9 100755
--- a/egs/librispeech/ASR/pruned_transducer_stateless5/decode.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless5/decode.py
@@ -464,7 +464,7 @@ def decode_one_batch(
         key += f"max_contexts_{params.max_contexts}_"
         key += f"max_states_{params.max_states}"
         if "nbest" in params.decoding_method:
-            key += f"num_paths_{params.num_paths}_"
+            key += f"_num_paths_{params.num_paths}_"
             key += f"nbest_scale_{params.nbest_scale}"
             if "LG" in params.decoding_method:
                 key += f"_ngram_lm_scale_{params.ngram_lm_scale}"