diff --git a/detect.py b/detect.py
index 4a955253..611c05a5 100644
--- a/detect.py
+++ b/detect.py
@@ -31,7 +31,7 @@ def detect(
 
     # Load weights
     if weights.endswith('.pt'):  # pytorch format
-        if weights.endswith('yolov3.pt') and not os.path.isfile(weights) and (platform == 'darwin'):
+        if weights.endswith('yolov3.pt') and not os.path.exists(weights) and (platform == 'darwin'):
             os.system('wget https://storage.googleapis.com/ultralytics/yolov3.pt -O ' + weights)
         model.load_state_dict(torch.load(weights, map_location='cpu')['model'])
     else:  # darknet format