diff --git a/cosyvoice/flow/flow_matching.py b/cosyvoice/flow/flow_matching.py
index d3beb9ec2..3f992cdbd 100644
--- a/cosyvoice/flow/flow_matching.py
+++ b/cosyvoice/flow/flow_matching.py
@@ -170,7 +170,7 @@ def compute_loss(self, x1, mask, mu, spks=None, cond=None, streaming=False):
             y: conditional flow
                 shape: (batch_size, n_feats, mel_timesteps)
         """
-        b, _, t = mu.shape
+        b, _, _ = mu.shape
 
         # random timestep
         t = torch.rand([b, 1, 1], device=mu.device, dtype=mu.dtype)