diff --git a/synapse/rest/client/v2_alpha/report_event.py b/synapse/rest/client/v2_alpha/report_event.py
index 9c1c9662c..8903e1240 100644
--- a/synapse/rest/client/v2_alpha/report_event.py
+++ b/synapse/rest/client/v2_alpha/report_event.py
@@ -33,6 +33,7 @@ class ReportEventRestServlet(RestServlet):
         super(ReportEventRestServlet, self).__init__()
         self.hs = hs
         self.auth = hs.get_auth()
+        self.clock = hs.get_clock()
         self.store = hs.get_datastore()
 
     @defer.inlineCallbacks
@@ -48,6 +49,7 @@ class ReportEventRestServlet(RestServlet):
             user_id=user_id,
             reason=body.get("reason"),
             content=body,
+            received_ts=self.clock.time_msec(),
         )
 
         defer.returnValue((200, {}))
diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index 045ae6c03..7122b0cbb 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -114,6 +114,7 @@ class DataStore(RoomMemberStore, RoomStore,
         self._state_groups_id_gen = StreamIdGenerator(db_conn, "state_groups", "id")
         self._access_tokens_id_gen = IdGenerator(db_conn, "access_tokens", "id")
         self._refresh_tokens_id_gen = IdGenerator(db_conn, "refresh_tokens", "id")
+        self._event_reports_id_gen = IdGenerator(db_conn, "event_reports", "id")
         self._push_rule_id_gen = IdGenerator(db_conn, "push_rules", "id")
         self._push_rules_enable_id_gen = IdGenerator(db_conn, "push_rules_enable", "id")
         self._push_rules_stream_id_gen = ChainedIdGenerator(
diff --git a/synapse/storage/room.py b/synapse/storage/room.py
index ceced7d51..26933e593 100644
--- a/synapse/storage/room.py
+++ b/synapse/storage/room.py
@@ -223,10 +223,14 @@ class RoomStore(SQLBaseStore):
 
         defer.returnValue((name, aliases))
 
-    def add_event_report(self, room_id, event_id, user_id, reason, content):
+    def add_event_report(self, room_id, event_id, user_id, reason, content,
+                         received_ts):
+        next_id = self._event_reports_id_gen.get_next()
         return self._simple_insert(
             table="event_reports",
             values={
+                "id": next_id,
+                "received_ts": received_ts,
                 "room_id": room_id,
                 "event_id": event_id,
                 "user_id": user_id,
diff --git a/synapse/storage/schema/delta/32/reports.sql b/synapse/storage/schema/delta/32/reports.sql
index 06bf0d9b5..3f2502745 100644
--- a/synapse/storage/schema/delta/32/reports.sql
+++ b/synapse/storage/schema/delta/32/reports.sql
@@ -15,6 +15,8 @@
 
 
 CREATE TABLE event_reports(
+    id BIGINT NOT NULL,
+    received_ts BIGINT NOT NULL,
     room_id TEXT NOT NULL,
     event_id TEXT NOT NULL,
     user_id TEXT NOT NULL,