diff --git a/client/coral-framework/components/Slot.js b/client/coral-framework/components/Slot.js
index 691dcad68..84125e03d 100644
--- a/client/coral-framework/components/Slot.js
+++ b/client/coral-framework/components/Slot.js
@@ -1,9 +1,9 @@
-import React, {Component} from 'react';
-import {getSlotElements} from 'coral-framework/helpers/plugins';
+import React, { Component } from "react";
+import { getSlotElements } from "coral-framework/helpers/plugins";
 
 class Slot extends Component {
   render() {
-    const {fill, ...rest} = this.props;
+    const { fill, ...rest } = this.props;
     return (
       <div>
         {getSlotElements(fill, rest)}
@@ -12,4 +12,8 @@ class Slot extends Component {
   }
 }
 
+Slot.propTypes = {
+  fill: React.PropTypes.string
+};
+
 export default Slot;