diff --git a/types/react-custom-scrollbars/index.d.ts b/types/react-custom-scrollbars/index.d.ts
index 7f60cc8a2a..f21ec7adba 100644
--- a/types/react-custom-scrollbars/index.d.ts
+++ b/types/react-custom-scrollbars/index.d.ts
@@ -44,8 +44,8 @@ declare module "react-custom-scrollbars" {
         universal?: boolean;
 
         autoHeight?: boolean;
-        autoHeightMin?: number;
-        autoHeightMax?: number;
+        autoHeightMin?: number | string;
+        autoHeightMax?: number | string;
     }
 
     export default class Scrollbars extends React.Component<ScrollbarProps> {