diff --git a/observation_portal/observations/serializers.py b/observation_portal/observations/serializers.py
index e3c06494..65ea88bc 100644
--- a/observation_portal/observations/serializers.py
+++ b/observation_portal/observations/serializers.py
@@ -348,9 +348,11 @@ def update(self, instance, validated_data):
                     start__lte=instance.end,
                     start__gte=old_end_time,
                     state='PENDING'
-                ).exclude(
-                    request__request_group__observation_type=RequestGroup.RAPID_RESPONSE
                 )
+                if instance.request.request_group.observation_type != RequestGroup.RAPID_RESPONSE:
+                    observations = observations.exclude(
+                        request__request_group__observation_type=RequestGroup.RAPID_RESPONSE
+                    )
                 num_canceled = Observation.cancel(observations)
                 logger.info(
                     "updated end time for observation {instance.id} to {instance.end}. Canceled {num_canceled} overlapping observations.")
diff --git a/observation_portal/observations/tests.py b/observation_portal/observations/tests.py
index be14e0c0..be1491e5 100644
--- a/observation_portal/observations/tests.py
+++ b/observation_portal/observations/tests.py
@@ -977,7 +977,7 @@ def test_update_observation_end_time_succeeds(self):
         observation.refresh_from_db()
         self.assertEqual(observation.end, new_end)
 
-    def test_update_observation_end_time_cancels_overlapping_observations(self):
+    def test_update_observation_end_time_cancels_proper_overlapping_observations(self):
         original_end = datetime(2016, 9, 2, 23, 35, 40).replace(tzinfo=timezone.utc)
         self.window.start = datetime(2016, 9, 1, tzinfo=timezone.utc)
         self.window.save()
@@ -989,8 +989,14 @@ def test_update_observation_end_time_cancels_overlapping_observations(self):
         self._create_observation(observation)
         observation = Observation.objects.first()
         cancel_obs_1 = self._create_clone_observation(observation, datetime(2016, 9, 2, 23, 35, 41), datetime(2016, 9, 2, 23, 39, 59))
-        cancel_obs_2 = self._create_clone_observation(observation, datetime(2016, 9, 2, 23, 40, 0), datetime(2016, 9, 2, 13, 55, 34))
+        cancel_obs_2 = self._create_clone_observation(observation, datetime(2016, 9, 2, 23, 42, 0), datetime(2016, 9, 2, 23, 55, 34))
         extra_obs_1 = self._create_clone_observation(observation, datetime(2016, 9, 2, 23, 55, 35), datetime(2016, 9, 3, 0, 14, 21))
+        rr_obs_1 = self._create_clone_observation(observation, datetime(2016, 9, 2, 23, 40, 0), datetime(2016, 9, 2, 23, 41, 59))
+        rr_requestgroup = create_simple_requestgroup(self.user, self.proposal, window=self.window, location=self.location)
+        rr_requestgroup.observation_type = RequestGroup.RAPID_RESPONSE
+        rr_requestgroup.save()
+        rr_obs_1.request = rr_requestgroup.requests.first()
+        rr_obs_1.save()
 
         new_end = datetime(2016, 9, 2, 23, 47, 22).replace(tzinfo=timezone.utc)
         update_data = {"end": datetime.strftime(new_end, '%Y-%m-%dT%H:%M:%SZ')}
@@ -1003,6 +1009,27 @@ def test_update_observation_end_time_cancels_overlapping_observations(self):
         self.assertEqual(cancel_obs_2.state, 'CANCELED')
         extra_obs_1.refresh_from_db()
         self.assertEqual(extra_obs_1.state, 'PENDING')
+        rr_obs_1.refresh_from_db()
+        self.assertEqual(rr_obs_1.state, 'PENDING')
+
+    def test_update_observation_end_time_rr_cancels_overlapping_rr(self):
+        self.window.start = datetime(2016, 9, 1, tzinfo=timezone.utc)
+        self.window.save()
+        self.requestgroup.observation_type = RequestGroup.RAPID_RESPONSE
+        self.requestgroup.save()
+        observation = self._generate_observation_data(
+            self.requestgroup.requests.first().id, [self.requestgroup.requests.first().configurations.first().id],
+            start="2016-09-02T22:35:39Z",
+            end="2016-09-02T23:35:40Z"
+        )
+        self._create_observation(observation)
+        observation = Observation.objects.first()
+        cancel_obs_1 = self._create_clone_observation(observation, datetime(2016, 9, 2, 23, 35, 41), datetime(2016, 9, 2, 23, 39, 59))
+        new_end = datetime(2016, 9, 2, 23, 47, 22).replace(tzinfo=timezone.utc)
+        update_data = {"end": datetime.strftime(new_end, '%Y-%m-%dT%H:%M:%SZ')}
+        self.client.patch(reverse('api:observations-detail', args=(observation.id,)), update_data)
+        cancel_obs_1.refresh_from_db()
+        self.assertEqual(cancel_obs_1.state, 'CANCELED')
 
     def test_update_observation_end_before_start_does_nothing(self):
         original_end = datetime(2016, 9, 5, 23, 35, 40).replace(tzinfo=timezone.utc)