diff --git a/lib/link.js b/lib/link.js
index c7da8fa6..6af31e54 100644
--- a/lib/link.js
+++ b/lib/link.js
@@ -15,7 +15,7 @@ export default class Link extends Component {
   }
 
   static propTypes = exact({
-    href: PropTypes.oneOfType([PropTypes.string, PropTypes.object]),
+    href: PropTypes.oneOfType([PropTypes.string, PropTypes.object]).isRequired,
     as: PropTypes.oneOfType([PropTypes.string, PropTypes.object]),
     prefetch: PropTypes.bool,
     replace: PropTypes.bool,