diff --git a/TTS/vocoder/layers/losses.py b/TTS/vocoder/layers/losses.py
index e705b1e0..1107b3c5 100644
--- a/TTS/vocoder/layers/losses.py
+++ b/TTS/vocoder/layers/losses.py
@@ -4,13 +4,15 @@ from torch import nn
 from torch.nn import functional as F
 
 
-class TorchSTFT():
+class TorchSTFT(nn.Module):
     def __init__(self, n_fft, hop_length, win_length, window='hann_window'):
         """ Torch based STFT operation """
+        super(TorchSTFT, self).__init__()
         self.n_fft = n_fft
         self.hop_length = hop_length
         self.win_length = win_length
-        self.window = getattr(torch, window)(win_length)
+        self.window = nn.Parameter(getattr(torch, window)(win_length),
+                                   requires_grad=False)
 
     def __call__(self, x):
         # B x D x T x 2
@@ -22,7 +24,8 @@ class TorchSTFT():
                        center=True,
                        pad_mode="reflect",  # compatible with audio.py
                        normalized=False,
-                       onesided=True)
+                       onesided=True,
+                       return_complex=False)
         M = o[:, :, :, 0]
         P = o[:, :, :, 1]
         return torch.sqrt(torch.clamp(M ** 2 + P ** 2, min=1e-8))