diff --git a/backend/src/utils.ts b/backend/src/utils.ts
index f29d990c..af3b5ad8 100644
--- a/backend/src/utils.ts
+++ b/backend/src/utils.ts
@@ -1221,26 +1221,12 @@ export function resolveUserId(bot: Client, value: string) {
     return mentionMatch[1];
   }
 
-  // A non-mention, full username?
-  const oldUsernameMatch = value.match(/^@?([^#]+)#(\d{4})$/);
-  if (oldUsernameMatch) {
-    const profiler = getProfiler();
-    const start = performance.now();
-    const user = bot.users.cache.find(
-      (u) => u.username === oldUsernameMatch[1] && u.discriminator === oldUsernameMatch[2],
-    );
-    profiler?.addDataPoint("utils:resolveUserId:usernameMatch", performance.now() - start);
-    if (user) {
-      return user.id;
-    }
-  }
-
-  // new usernames system
-  const usernameMatch = value.match(/^@?([^#]+)$/);
+  // a username
+  const usernameMatch = value.match(/^@?(\S{3,})$/);
   if (usernameMatch) {
     const profiler = getProfiler();
     const start = performance.now();
-    const user = bot.users.cache.find((u) => u.username === usernameMatch[1]);
+    const user = bot.users.cache.find((u) => u.tag === usernameMatch[1]);
     profiler?.addDataPoint("utils:resolveUserId:usernameMatch", performance.now() - start);
     if (user) {
       return user.id;