diff --git a/src/components/Flex.js b/src/components/Flex.js
index 3d6053c6..d32e0ef8 100644
--- a/src/components/Flex.js
+++ b/src/components/Flex.js
@@ -24,7 +24,7 @@ Flex.defaultProps = {
 };
 
 Flex.propTypes = {
-  children: React.PropTypes.node.isRequired,
+  children: React.PropTypes.node,
   direction: React.PropTypes.string,
   justify: React.PropTypes.string,
   align: React.PropTypes.string,