diff --git a/src/api/routes/interactions/#interaction_id/#interaction_token/callback.ts b/src/api/routes/interactions/#interaction_id/#interaction_token/callback.ts
index b8b7d03ee..9164ae7e1 100644
--- a/src/api/routes/interactions/#interaction_id/#interaction_token/callback.ts
+++ b/src/api/routes/interactions/#interaction_id/#interaction_token/callback.ts
@@ -189,6 +189,8 @@ router.post(
                 // TODO
                 break;
             */
+            default:
+                body satisfies never;
         }
 
         pendingInteractions.delete(interactionId);