diff --git a/src/validate/validate.schema.ts b/src/validate/validate.schema.ts
index 6c2d9a5e..8f73811d 100644
--- a/src/validate/validate.schema.ts
+++ b/src/validate/validate.schema.ts
@@ -170,7 +170,7 @@ export const audioMessageSchema: JSONSchema7 = {
       properties: {
         audio: { type: 'string' },
       },
-      required: ['audio', 'number'],
+      required: ['audio'],
       ...isNotEmpty('audio'),
     },
   },