diff --git a/src/lib/openapi/spec/user-schema.ts b/src/lib/openapi/spec/user-schema.ts
index d41c50beb4..31a1535752 100644
--- a/src/lib/openapi/spec/user-schema.ts
+++ b/src/lib/openapi/spec/user-schema.ts
@@ -36,6 +36,7 @@ export const userSchema = {
             description: 'A unique username for the user',
             type: 'string',
             example: 'hunter',
+            nullable: true,
         },
         imageUrl: {
             description: `URL used for the userprofile image`,