diff --git a/src/matrix/room/BaseRoom.js b/src/matrix/room/BaseRoom.js
index 531f6a1a..9269404a 100644
--- a/src/matrix/room/BaseRoom.js
+++ b/src/matrix/room/BaseRoom.js
@@ -17,6 +17,7 @@ limitations under the License.
 import {EventEmitter} from "../../utils/EventEmitter.js";
 import {RoomSummary} from "./RoomSummary.js";
 import {GapWriter} from "./timeline/persistence/GapWriter.js";
+import {RelationWriter} from "./timeline/persistence/RelationWriter.js";
 import {Timeline} from "./timeline/Timeline.js";
 import {FragmentIdComparer} from "./timeline/FragmentIdComparer.js";
 import {WrappedError} from "../error.js"
@@ -266,10 +267,16 @@ export class BaseRoom extends EventEmitter {
                 // detect remote echos of pending messages in the gap
                 extraGapFillChanges = await this._writeGapFill(response.chunk, txn, log);
                 // write new events into gap
+                const relationWriter = new RelationWriter({
+                    roomId: this._roomId,
+                    fragmentIdComparer: this._fragmentIdComparer,
+                    ownUserId: this._user.id,
+                });
                 const gapWriter = new GapWriter({
                     roomId: this._roomId,
                     storage: this._storage,
                     fragmentIdComparer: this._fragmentIdComparer,
+                    relationWriter
                 });
                 gapResult = await gapWriter.writeFragmentFill(fragmentEntry, response, txn, log);
             } catch (err) {
diff --git a/src/matrix/room/Room.js b/src/matrix/room/Room.js
index da9eef52..0361e069 100644
--- a/src/matrix/room/Room.js
+++ b/src/matrix/room/Room.js
@@ -16,6 +16,8 @@ limitations under the License.
 
 import {BaseRoom} from "./BaseRoom.js";
 import {SyncWriter} from "./timeline/persistence/SyncWriter.js";
+import {MemberWriter} from "./timeline/persistence/MemberWriter.js";
+import {RelationWriter} from "./timeline/persistence/RelationWriter.js";
 import {SendQueue} from "./sending/SendQueue.js";
 import {WrappedError} from "../error.js"
 import {Heroes} from "./members/Heroes.js";
@@ -28,7 +30,17 @@ export class Room extends BaseRoom {
     constructor(options) {
         super(options);
         const {pendingEvents} = options;
-        this._syncWriter = new SyncWriter({roomId: this.id, fragmentIdComparer: this._fragmentIdComparer});
+        const relationWriter = new RelationWriter({
+            roomId: this.id,
+            fragmentIdComparer: this._fragmentIdComparer,
+            ownUserId: this._user.id
+        });
+        this._syncWriter = new SyncWriter({
+            roomId: this.id,
+            fragmentIdComparer: this._fragmentIdComparer,
+            relationWriter,
+            memberWriter: new MemberWriter(this.id)
+        });
         this._sendQueue = new SendQueue({roomId: this.id, storage: this._storage, hsApi: this._hsApi, pendingEvents});
     }
 
diff --git a/src/matrix/room/timeline/persistence/GapWriter.js b/src/matrix/room/timeline/persistence/GapWriter.js
index 67668298..5e49695a 100644
--- a/src/matrix/room/timeline/persistence/GapWriter.js
+++ b/src/matrix/room/timeline/persistence/GapWriter.js
@@ -14,18 +14,17 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import {RelationWriter} from "./RelationWriter.js";
 import {EventKey} from "../EventKey.js";
 import {EventEntry} from "../entries/EventEntry.js";
 import {createEventEntry, directionalAppend} from "./common.js";
 import {RoomMember, EVENT_TYPE as MEMBER_EVENT_TYPE} from "../../members/RoomMember.js";
 
 export class GapWriter {
-    constructor({roomId, storage, fragmentIdComparer}) {
+    constructor({roomId, storage, fragmentIdComparer, relationWriter}) {
         this._roomId = roomId;
         this._storage = storage;
         this._fragmentIdComparer = fragmentIdComparer;
-        this._relationWriter = new RelationWriter(roomId, fragmentIdComparer);
+        this._relationWriter = relationWriter;
     }
     // events is in reverse-chronological order (last event comes at index 0) if backwards
     async _findOverlappingEvents(fragmentEntry, events, txn, log) {
diff --git a/src/matrix/room/timeline/persistence/RelationWriter.js b/src/matrix/room/timeline/persistence/RelationWriter.js
index 45716d04..305fc8eb 100644
--- a/src/matrix/room/timeline/persistence/RelationWriter.js
+++ b/src/matrix/room/timeline/persistence/RelationWriter.js
@@ -18,8 +18,9 @@ import {EventEntry} from "../entries/EventEntry.js";
 import {REDACTION_TYPE} from "../../common.js";
 
 export class RelationWriter {
-    constructor(roomId, fragmentIdComparer) {
+    constructor({roomId, ownUserId, fragmentIdComparer}) {
         this._roomId = roomId;
+        this._ownUserId = ownUserId;
         this._fragmentIdComparer = fragmentIdComparer;
     }
 
diff --git a/src/matrix/room/timeline/persistence/SyncWriter.js b/src/matrix/room/timeline/persistence/SyncWriter.js
index 671b944a..39d341ef 100644
--- a/src/matrix/room/timeline/persistence/SyncWriter.js
+++ b/src/matrix/room/timeline/persistence/SyncWriter.js
@@ -20,8 +20,6 @@ import {EventEntry} from "../entries/EventEntry.js";
 import {FragmentBoundaryEntry} from "../entries/FragmentBoundaryEntry.js";
 import {createEventEntry} from "./common.js";
 import {EVENT_TYPE as MEMBER_EVENT_TYPE} from "../../members/RoomMember.js";
-import {MemberWriter} from "./MemberWriter.js";
-import {RelationWriter} from "./RelationWriter.js";
 
 // Synapse bug? where the m.room.create event appears twice in sync response
 // when first syncing the room
@@ -38,10 +36,10 @@ function deduplicateEvents(events) {
 }
 
 export class SyncWriter {
-    constructor({roomId, fragmentIdComparer}) {
+    constructor({roomId, fragmentIdComparer, memberWriter, relationWriter}) {
         this._roomId = roomId;
-        this._memberWriter = new MemberWriter(roomId);
-        this._relationWriter = new RelationWriter(roomId, fragmentIdComparer);
+        this._memberWriter = memberWriter;
+        this._relationWriter = relationWriter;
         this._fragmentIdComparer = fragmentIdComparer;
         this._lastLiveKey = null;
     }