diff --git a/sharepoint/SharePoint.d.ts b/sharepoint/SharePoint.d.ts
index 0cb60b5c64..e1a0960845 100644
--- a/sharepoint/SharePoint.d.ts
+++ b/sharepoint/SharePoint.d.ts
@@ -7329,7 +7329,7 @@ declare module SP {
             /** Displays a wait/loading modal dialog with the specified title, message, height and width. Height and width are defined in pixels. Cancel button is shown. If user clicks it, the callbackFunc is called. */
             static showWaitScreenSize(title: string, message?: string, callbackFunc?: SP.UI.DialogReturnValueCallback, height?: number, width?: number): SP.UI.ModalDialog;
             static showPlatformFirstRunDialog(url: string, callbackFunc: SP.UI.DialogReturnValueCallback): SP.UI.ModalDialog;
-            static get_childDialog: ModalDialog;
+            static get_childDialog(): SP.UI.ModalDialog;
             /** Closes the dialog using the specified dialog result. */
             close(dialogResult: SP.UI.DialogResult): void;
         }