diff --git a/src/activitypub/mocks.js b/src/activitypub/mocks.js
index c0fd614529..d3c97f5da4 100644
--- a/src/activitypub/mocks.js
+++ b/src/activitypub/mocks.js
@@ -21,8 +21,6 @@ const utils = require('../utils');
 
 const accountHelpers = require('../controllers/accounts/helpers');
 
-const isEmojiShortcode = /^:[\w]+:$/;
-
 const activitypub = module.parent.exports;
 const Mocks = module.exports;