diff --git a/types/iframe-resizer/index.d.ts b/types/iframe-resizer/index.d.ts
index 8d65629da6..70d9c1d4f3 100644
--- a/types/iframe-resizer/index.d.ts
+++ b/types/iframe-resizer/index.d.ts
@@ -37,7 +37,7 @@ export interface IFrameOptions {
    * If your iFrame navigates between different domains, ports or protocols; then you will need to
    * provide an array of URLs or disable this option.
    */
-  checkOrigin?: boolean;
+  checkOrigin?: boolean | string[];
   /**
    * When enabled in page linking inside the iFrame and from the iFrame to the parent page will be enabled.
    */