diff --git a/egs/librispeech/ASR/pruned_transducer_stateless7/zipformer.py b/egs/librispeech/ASR/pruned_transducer_stateless7/zipformer.py
index 5b510a71d..47a5efea1 100644
--- a/egs/librispeech/ASR/pruned_transducer_stateless7/zipformer.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless7/zipformer.py
@@ -545,7 +545,7 @@ class ZipformerEncoder(nn.Module):
     ) -> None:
         super().__init__()
         self.encoder_pos = CompactRelPositionalEncoding(pos_dim, dropout_rate=0.15,
-                                                        length_factor=1.5)
+                                                        length_factor=3.0)
 
         self.layers = nn.ModuleList(
             [copy.deepcopy(encoder_layer) for i in range(num_layers)]