# UNDF: UNDF-2026-000000062
--- a/apps/web/src/TextForEvent.tsx
+++ b/apps/web/src/TextForEvent.tsx
@@ -498,13 +498,9 @@ function textForPowerEvent(event: MatrixEvent, client: MatrixClient): (() => str
     const previousUserDefault: number = event.getPrevContent().users_default || 0;
     const currentUserDefault: number = event.getContent().users_default || 0;
-    // Construct set of userIds
-    const users: string[] = [];
-    Object.keys(event.getContent().users).forEach((userId) => {
-        if (users.indexOf(userId) === -1) users.push(userId);
-    });
-    Object.keys(event.getPrevContent().users).forEach((userId) => {
-        if (users.indexOf(userId) === -1) users.push(userId);
-    });
+    // Deduplicate userIds from current and previous content; O(U) via Set
+    const users = Array.from(
+        new Set([...Object.keys(event.getContent().users), ...Object.keys(event.getPrevContent().users)]),
+    );