diff --git a/app/javascript/flavours/glitch/util/emoji/index.js b/app/javascript/flavours/glitch/util/emoji/index.js
index b2d13cc959a..e1a244127d3 100644
--- a/app/javascript/flavours/glitch/util/emoji/index.js
+++ b/app/javascript/flavours/glitch/util/emoji/index.js
@@ -100,4 +100,4 @@ export const buildCustomEmojis = (customEmojis) => {
   return emojis;
 };
 
-export const categoriesFromEmojis = customEmojis => customEmojis.reduce((set, emoji) => set.add(emoji.get('category') ? `custom-${emoji.get('category')}` : 'custom'), new Set());
+export const categoriesFromEmojis = customEmojis => customEmojis.reduce((set, emoji) => set.add(emoji.get('category') ? `custom-${emoji.get('category')}` : 'custom'), new Set(['custom']));