diff --git a/mmdet/models/backbones/darknet.py b/mmdet/models/backbones/darknet.py
index 2aa9c37c444..92c02024b1f 100644
--- a/mmdet/models/backbones/darknet.py
+++ b/mmdet/models/backbones/darknet.py
@@ -47,7 +47,7 @@ def make_conv_and_res_block(in_channels, out_channels, res_repeat):
     return model
 
 
-@BACKBONES.register_module
+@BACKBONES.register_module()
 class DarkNet53(nn.Module):
 
     def __init__(self,
diff --git a/mmdet/models/dense_heads/yolo_head.py b/mmdet/models/dense_heads/yolo_head.py
index 42ab39888c4..06f14e71ee0 100644
--- a/mmdet/models/dense_heads/yolo_head.py
+++ b/mmdet/models/dense_heads/yolo_head.py
@@ -22,7 +22,7 @@
 _EPSILON = 1e-6
 
 
-@HEADS.register_module
+@HEADS.register_module()
 class YoloHead(BaseDenseHead):
 
     # TODO: Move into cfg
diff --git a/mmdet/models/detectors/yolo.py b/mmdet/models/detectors/yolo.py
index bd769784bae..c7f71cccc37 100644
--- a/mmdet/models/detectors/yolo.py
+++ b/mmdet/models/detectors/yolo.py
@@ -4,7 +4,7 @@
 from ..builder import DETECTORS
 
 
-@DETECTORS.register_module
+@DETECTORS.register_module()
 class YoloNet(SingleStageDetector):
 
     def __init__(self,
diff --git a/mmdet/models/necks/yolo_neck.py b/mmdet/models/necks/yolo_neck.py
index c9c93290441..21c7257da64 100644
--- a/mmdet/models/necks/yolo_neck.py
+++ b/mmdet/models/necks/yolo_neck.py
@@ -45,7 +45,7 @@ def forward(self, x):
         return out
 
 
-@NECKS.register_module
+@NECKS.register_module()
 class YoloNeck(nn.Module):
 
     """The tail side of the YoloNet.