diff --git a/plugins/kafka-backend/config.d.ts b/plugins/kafka-backend/config.d.ts
index 1417c1fe63..3e7c196bd7 100644
--- a/plugins/kafka-backend/config.d.ts
+++ b/plugins/kafka-backend/config.d.ts
@@ -31,10 +31,10 @@ export interface Config {
        */
       ssl?:
         | {
-            ca: string[];
+            ca?: string[];
             /** @visibility secret */
             key?: string;
-            cert: string;
+            cert?: string;
             rejectUnauthorized?: boolean;
           }
         | boolean;