diff --git a/face_recog/detector.py b/face_recog/detector.py
index 5558f27..23d53a2 100644
--- a/face_recog/detector.py
+++ b/face_recog/detector.py
@@ -65,7 +65,7 @@ def _save_embeddings(self, embeddings):
 
     def _send_unknown_message(self, boxes, image):
         message = f"{len(boxes)} unknown faces detected"
-        for (top, right, bottom, left) in zip(boxes):
+        for (top, right, bottom, left) in boxes:
             cv2.rectangle(image, (left, top), (right, bottom),
                 (0, 255, 225), 2)
         self.slack_client.send_image(self.channel_id, message, image)