diff --git a/src/routes/_api/timelines.js b/src/routes/_api/timelines.js
index 38807ab7..56cec1d5 100644
--- a/src/routes/_api/timelines.js
+++ b/src/routes/_api/timelines.js
@@ -66,7 +66,7 @@ export async function getTimeline (instanceName, accessToken, timeline, maxId, s
   }
 
   if (timeline === 'notifications/mentions') {
-    params.exclude_types = ['follow', 'favourite', 'reblog', 'poll']
+    params.exclude_types = ['follow', 'favourite', 'reblog', 'poll', 'admin.sign_up']
   }
 
   url += '?' + paramsString(params)