diff --git a/packages/xod-client/src/tooltip/components/TooltipHOC.jsx b/packages/xod-client/src/tooltip/components/TooltipHOC.jsx
index 3165c4fc..35c7fd3c 100644
--- a/packages/xod-client/src/tooltip/components/TooltipHOC.jsx
+++ b/packages/xod-client/src/tooltip/components/TooltipHOC.jsx
@@ -77,7 +77,7 @@ class TooltipHOC extends React.Component {
 }
 
 TooltipHOC.propTypes = {
-  content: PropTypes.node.isRequired,
+  content: PropTypes.node,
   render: PropTypes.func.isRequired,
 };