diff --git a/vocoder/models/multiband_melgan_generator.py b/vocoder/models/multiband_melgan_generator.py
index 8feacd25..15e7426e 100644
--- a/vocoder/models/multiband_melgan_generator.py
+++ b/vocoder/models/multiband_melgan_generator.py
@@ -29,10 +29,11 @@ class MultibandMelganGenerator(MelganGenerator):
     def pqmf_synthesis(self, x):
         return self.pqmf_layer.synthesis(x)
 
+    @torch.no_grad()
     def inference(self, cond_features):
         cond_features = cond_features.to(self.layers[1].weight.device)
         cond_features = torch.nn.functional.pad(
             cond_features,
             (self.inference_padding, self.inference_padding),
             'replicate')
-        return self.pqmf.synthesis(self.layers(cond_features))
+        return self.pqmf_synthesis(self.layers(cond_features))