diff --git a/src/matrix/room/Room.js b/src/matrix/room/Room.js
index a5bce14f..12c17580 100644
--- a/src/matrix/room/Room.js
+++ b/src/matrix/room/Room.js
@@ -158,7 +158,7 @@ export class Room extends BaseRoom {
             summaryChanges = this._summary.writeData(summaryChanges, txn);
         }
         if (summaryChanges) {
-            log.set("summaryChanges", summaryChanges.diff(this._summary.data));
+            log.set("summaryChanges", summaryChanges.changedKeys(this._summary.data));
         }
         // fetch new members while we have txn open,
         // but don't make any in-memory changes yet
diff --git a/src/matrix/room/RoomSummary.js b/src/matrix/room/RoomSummary.js
index 410352ca..a3dec467 100644
--- a/src/matrix/room/RoomSummary.js
+++ b/src/matrix/room/RoomSummary.js
@@ -203,16 +203,11 @@ export class SummaryData {
         this.cloned = copy ? true : false;
     }
 
-    diff(other) {
+    changedKeys(other) {
         const props = Object.getOwnPropertyNames(this);
-        return props.reduce((diff, prop) => {
-            if (prop !== "cloned") {
-                if (this[prop] !== other[prop]) {
-                    diff[prop] = this[prop];
-                }
-            }
-            return diff;
-        }, {});
+        return props.filter(prop => {
+            return prop !== "cloned" && this[prop] !== other[prop]
+        });
     }
 
     cloneIfNeeded() {