diff --git a/utils/utils.py b/utils/utils.py
index c396be03..5a1a4912 100755
--- a/utils/utils.py
+++ b/utils/utils.py
@@ -459,7 +459,7 @@ def build_targets(model, targets):
     return tcls, tbox, indices, av
 
 
-def non_max_suppression(prediction, conf_thres=0.5, nms_thres=0.5, multi_cls=True, method='vision'):
+def non_max_suppression(prediction, conf_thres=0.5, nms_thres=0.5, multi_cls=False, method='vision'):
     """
     Removes detections with lower object confidence score than 'conf_thres'
     Non-Maximum Suppression to further filter detections.