diff --git a/packages/backend/src/core/CustomEmojiService.ts b/packages/backend/src/core/CustomEmojiService.ts
index edb9335b6e..1c75566755 100644
--- a/packages/backend/src/core/CustomEmojiService.ts
+++ b/packages/backend/src/core/CustomEmojiService.ts
@@ -20,7 +20,7 @@ import { query } from '@/misc/prelude/url.js';
 import type { Serialized } from '@/types.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
 
-const parseEmojiStrRegexp = /^(\w+)(?:@([\w.-]+))?$/;
+const parseEmojiStrRegexp = /^([-\w]+)(?:@([\w.-]+))?$/;
 
 @Injectable()
 export class CustomEmojiService implements OnApplicationShutdown {