diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index fdd9b33977..09baf2f88c 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,7 +6,10 @@ This document describes changes between each past release.
 3.2.4 (unreleased)
 ==================
 
-- Nothing changed yet.
+**Bug fixes**
+
+- Fix bug where the resource events of a request targetting two groups/collection
+  from different buckets would be grouped together.
 
 
 3.2.3 (2016-07-18)
diff --git a/kinto/core/events.py b/kinto/core/events.py
index 3a2de3afdd..1a962cd56f 100644
--- a/kinto/core/events.py
+++ b/kinto/core/events.py
@@ -131,7 +131,8 @@ def get_resource_events(request, after_commit=False):
     return events
 
 
-def notify_resource_event(request, timestamp, data, action, old=None):
+def notify_resource_event(request, parent_id, timestamp, data, action,
+                          old=None):
     """
     Request helper to stack a resource event.
 
@@ -156,8 +157,8 @@ def notify_resource_event(request, timestamp, data, action, old=None):
     events = request.bound_data.setdefault("resource_events", OrderedDict())
     resource_name = request.current_resource_name
 
-    # Add to impacted records or create new event.
-    group_by = resource_name + action.value
+    # Group events by resource and action.
+    group_by = resource_name + parent_id + action.value
 
     if group_by in events:
         already_impacted = events[group_by][2]
diff --git a/kinto/core/resource/__init__.py b/kinto/core/resource/__init__.py
index 40f600f94f..45b048327b 100644
--- a/kinto/core/resource/__init__.py
+++ b/kinto/core/resource/__init__.py
@@ -645,7 +645,9 @@ def postprocess(self, result, action=ACTIONS.READ, old=None):
             'data': result
         }
 
-        self.request.notify_resource_event(timestamp=self.timestamp,
+        parent_id = self.get_parent_id(self.request)
+        self.request.notify_resource_event(parent_id=parent_id,
+                                           timestamp=self.timestamp,
                                            data=result,
                                            action=action,
                                            old=old)
diff --git a/kinto/tests/core/resource/test_events.py b/kinto/tests/core/resource/test_events.py
index 84259b40d0..4c50b73a0f 100644
--- a/kinto/tests/core/resource/test_events.py
+++ b/kinto/tests/core/resource/test_events.py
@@ -93,6 +93,13 @@ class ResourceChangedTest(BaseEventTest, unittest.TestCase):
 
     subscribed = (ResourceChanged,)
 
+    def test_events_have_custom_representation(self):
+        self.app.post_json(self.collection_url, self.body,
+                           headers=self.headers, status=201)
+        self.assertEqual(repr(self.events[0]),
+                         "<ResourceChanged action=create "
+                         "uri=%s>" % self.collection_url)
+
     def test_post_sends_create_action(self):
         self.app.post_json(self.collection_url, self.body,
                            headers=self.headers, status=201)
@@ -352,6 +359,25 @@ def test_one_event_is_sent_per_resource(self):
         self.app.post_json("/batch", body, headers=self.headers)
         self.assertEqual(len(self.events), 2)
 
+    def test_one_event_is_sent_per_parent_id(self):
+        # /mushrooms is a UserResource (see testapp.views), which means
+        # that parent_id depends on the authenticated user.
+        body = {
+            "defaults": {
+                "path": '/mushrooms',
+                "method": "POST",
+                "body": self.body
+            },
+            "requests": [
+                {"headers": {"Authorization": "Basic bWF0OjE="}},
+                {"headers": {"Authorization": "Basic dG90bzp0dXR1"}},
+                {"headers": {"Authorization": "Basic bWF0OjE="}},
+            ]
+        }
+        self.app.post_json("/batch", body, headers=self.headers)
+        # Two different auth headers, thus two different parent_id:
+        self.assertEqual(len(self.events), 2)
+
     def test_one_event_is_sent_per_action(self):
         body = {
             "defaults": {