diff --git a/mmdet/models/backbones/resnext.py b/mmdet/models/backbones/resnext.py
index f68c0e7e10e51e6a44eaf0897d16b93e6f8fcbfc..b36fa9b3790ea44bf77ac1c1a3abd07a730743f4 100644
--- a/mmdet/models/backbones/resnext.py
+++ b/mmdet/models/backbones/resnext.py
@@ -121,8 +121,8 @@ def make_res_layer(block,
     layers = []
     layers.append(
         block(
-            inplanes,
-            planes,
+            inplanes=inplanes,
+            planes=planes,
             stride=stride,
             dilation=dilation,
             downsample=downsample,
@@ -138,8 +138,8 @@ def make_res_layer(block,
     for i in range(1, blocks):
         layers.append(
             block(
-                inplanes,
-                planes,
+                inplanes=inplanes,
+                planes=planes,
                 stride=1,
                 dilation=dilation,
                 groups=groups,