diff --git a/model.py b/model.py
index 80d94db..b0e7c10 100644
--- a/model.py
+++ b/model.py
@@ -45,7 +45,7 @@ def forward(self, x):
         residual = self.conv1x1(x)
         out = self.relu(self.bn1(self.conv1(x)))
         out = self.relu(self.bn2(self.conv2(out)))
-        out += residual
+        out = out + residual
         out = self.relu(out)
         return out
 class SFConv(nn.Module):
@@ -139,7 +139,7 @@ def forward(self, x):
         residual = self.conv1x1(x)
         out = self.relu(self.bn1(self.conv1(x)))
         out = self.relu(self.bn2(self.conv2(out)))
-        out += residual
+        out = out + residual
         out = self.relu(out)
         return out
 class ER_Net(nn.Module):