diff --git a/egs/librispeech/ASR/pruned_transducer_stateless7_streaming/zipformer.py b/egs/librispeech/ASR/pruned_transducer_stateless7_streaming/zipformer.py
index a5c422959..c7e45564f 100644
--- a/egs/librispeech/ASR/pruned_transducer_stateless7_streaming/zipformer.py
+++ b/egs/librispeech/ASR/pruned_transducer_stateless7_streaming/zipformer.py
@@ -865,7 +865,7 @@ class ZipformerEncoderLayer(nn.Module):
             return final_dropout_rate
         else:
             return initial_dropout_rate - (
-                initial_dropout_rate * final_dropout_rate
+                initial_dropout_rate - final_dropout_rate
             ) * (self.batch_count / warmup_period)
 
     def forward(