diff --git a/typescript/core/widget.ts b/typescript/core/widget.ts
index 457b092f9..cc0675947 100644
--- a/typescript/core/widget.ts
+++ b/typescript/core/widget.ts
@@ -42,8 +42,8 @@ export interface _Widget extends _OB {
     element: {
         width(): number;
         height(): number;
-        width(width: number): _Widget['element'];
-        height(height: number): _Widget['element'];
+        width(width: number | string): _Widget['element'];
+        height(height: number | string): _Widget['element'];
         [key: string]: any;
     };
 
@@ -444,8 +444,8 @@ export declare class Widget extends OB {
     element: {
         width(): number;
         height(): number;
-        width(width: number): Widget['element'];
-        height(height: number): Widget['element'];
+        width(width: number | string): Widget['element'];
+        height(height: number | string): Widget['element'];
         [key: string]: any;
     };