diff --git a/types/xrm/index.d.ts b/types/xrm/index.d.ts
index 361e33bf92..61362fa208 100644
--- a/types/xrm/index.d.ts
+++ b/types/xrm/index.d.ts
@@ -4633,7 +4633,7 @@ declare namespace Xrm {
          * Invokes the device camera to capture an image.
          * @returns On success, returns Base64 encoded file
          */
-        captureImage(imageOptions: Device.CaptureImageOptions): Async.PromiseLike<Device.CaptureFileResponse>;
+        captureImage(imageOptions?: Device.CaptureImageOptions): Async.PromiseLike<Device.CaptureFileResponse>;
 
         /**
          * Invokes the device camera to capture video.