diff --git a/typography.tsx b/typography.tsx
index 1450a95..b596dfa 100644
--- a/typography.tsx
+++ b/typography.tsx
@@ -5,7 +5,7 @@ import React from "react";
 
 export interface Props {
     children?: React.ReactNode;
-    className?: String;
+    className?: string;
 }
 
 export class H1 extends React.Component<Props> {