diff --git a/python/caffe/classifier.py b/python/caffe/classifier.py
index 983760a786d..64d804be554 100644
--- a/python/caffe/classifier.py
+++ b/python/caffe/classifier.py
@@ -23,7 +23,7 @@ class Classifier(caffe.Net):
     def __init__(self, model_file, pretrained_file, image_dims=None,
                  mean=None, input_scale=None, raw_scale=None,
                  channel_swap=None):
-        caffe.Net.__init__(self, model_file, pretrained_file, caffe.TEST)
+        caffe.Net.__init__(self, model_file, caffe.TEST, weights=pretrained_file)
 
         # configure pre-processing
         in_ = self.inputs[0]
diff --git a/python/caffe/detector.py b/python/caffe/detector.py
index ef1f91730bf..ceee5d36f4c 100644
--- a/python/caffe/detector.py
+++ b/python/caffe/detector.py
@@ -35,7 +35,7 @@ class Detector(caffe.Net):
     def __init__(self, model_file, pretrained_file, mean=None,
                  input_scale=None, raw_scale=None, channel_swap=None,
                  context_pad=None):
-        caffe.Net.__init__(self, model_file, pretrained_file, caffe.TEST)
+        caffe.Net.__init__(self, model_file, caffe.TEST, weights=pretrained_file)
 
         # configure pre-processing
         in_ = self.inputs[0]