diff --git a/matter-js/matter-js.d.ts b/matter-js/matter-js.d.ts
index b0573e3bf6..da2c2f3eec 100644
--- a/matter-js/matter-js.d.ts
+++ b/matter-js/matter-js.d.ts
@@ -268,7 +268,7 @@ declare namespace Matter {
          * @type boolean
          * @default false
          */
-        isSensor: boolean;
+        isSensor?: boolean;
         /**
          * A flag that indicates whether the body is considered sleeping. A sleeping body acts similar to a static body, except it is only temporary and can be awoken.
          * If you need to set a body as sleeping, you should use `Sleeping.set` as this requires more than just setting this flag.