diff --git a/models.py b/models.py
index d352e873..ff3138af 100755
--- a/models.py
+++ b/models.py
@@ -118,16 +118,15 @@ class Swish(nn.Module):
         super(Swish, self).__init__()
 
     def forward(self, x):
-        return x * torch.sigmoid(x)
+        return x.mul_(torch.sigmoid(x))
 
 
 class Mish(nn.Module):  # https://github.com/digantamisra98/Mish
-    # Applies the mish function element-wise: mish(x) = x * tanh(softplus(x)) = x * tanh(ln(1 + exp(x)))
     def __init__(self):
         super().__init__()
 
     def forward(self, x):
-        return x * torch.tanh(F.softplus(x))
+        return x.mul_(F.softplus(x).tanh())
 
 
 class YOLOLayer(nn.Module):