diff --git a/detect_objects.py b/detect_objects.py
index c3bdc04ef..015c85ece 100644
--- a/detect_objects.py
+++ b/detect_objects.py
@@ -312,7 +312,7 @@ def main():
                 shm.close()
                 shm.unlink()
 
-        for detector in detectors:
+        for detector in detectors.values():
             detector.stop()
         for shm in camera_shms:
             shm.close()