diff --git a/frigate/motion/improved_motion.py b/frigate/motion/improved_motion.py
index 77eae26a9..b081d3791 100644
--- a/frigate/motion/improved_motion.py
+++ b/frigate/motion/improved_motion.py
@@ -239,6 +239,12 @@ class ImprovedMotionDetector(MotionDetector):
         )
         self.mask = np.where(resized_mask == [0])
 
+        # Reset motion detection state when mask changes
+        # so motion detection can quickly recalibrate with the new mask
+        self.avg_frame = np.zeros(self.motion_frame_size, np.float32)
+        self.calibrating = True
+        self.motion_frame_count = 0
+
     def stop(self) -> None:
         """stop the motion detector."""
         pass
diff --git a/frigate/video.py b/frigate/video.py
index 05ddf0f62..a139c25f1 100755
--- a/frigate/video.py
+++ b/frigate/video.py
@@ -771,6 +771,7 @@ def process_frames(
             camera_enabled = camera_config.enabled
 
         if "motion" in updated_configs:
+            motion_detector.config = camera_config.motion
             motion_detector.update_mask()
 
         if (