diff --git a/api/client-server/definitions/event_filter.yaml b/api/client-server/definitions/event_filter.yaml
index 1cae3ea9..8c96917f 100644
--- a/api/client-server/definitions/event_filter.yaml
+++ b/api/client-server/definitions/event_filter.yaml
@@ -11,7 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-title: Filter
+title: EventFilter
 properties:
   limit:
     description: The maximum number of events to return.
diff --git a/api/client-server/definitions/sync_filter.yaml b/api/client-server/definitions/sync_filter.yaml
index 69b245a3..33bead26 100644
--- a/api/client-server/definitions/sync_filter.yaml
+++ b/api/client-server/definitions/sync_filter.yaml
@@ -11,6 +11,8 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+type: object
+title: Filter
 properties:
   event_fields:
     description: List of event fields to include. If this list is absent then all
@@ -40,6 +42,7 @@ properties:
   room:
     title: RoomFilter
     description: Filters to be applied to room data.
+    type: object
     properties:
       not_rooms:
         description: A list of room IDs to exclude. If this list is absent then no rooms
@@ -76,5 +79,3 @@ properties:
         allOf:
         - $ref: room_event_filter.yaml
         description: The per user account data to include for rooms.
-    type: object
-type: object