diff --git a/easy-xapi/easy-xapi.d.ts b/easy-xapi/easy-xapi.d.ts
index 4afe5b44c..7e59a14b5 100644
--- a/easy-xapi/easy-xapi.d.ts
+++ b/easy-xapi/easy-xapi.d.ts
@@ -25,7 +25,7 @@ declare module "easy-xapi" {
         root: string;
         port: number;
         name: string;
-        xHeaderDefaults: Object;
+        xHeaderDefaults?: Object;
         log: {
             name: string;
             level: string