--- a/devtools/client/netmonitor/src/components/TabboxPanel.js
+++ b/devtools/client/netmonitor/src/components/TabboxPanel.js
@@ -141,12 +141,12 @@ TabboxPanel.displayName = "TabboxPanel";
 TabboxPanel.propTypes = {
   activeTabId: PropTypes.string,
   cloneSelectedRequest: PropTypes.func,
   connector: PropTypes.object.isRequired,
   openLink: PropTypes.func,
   request: PropTypes.object,
   selectTab: PropTypes.func.isRequired,
   sourceMapService: PropTypes.object,
-  hideToggleButton: PropTypes.boolean,
+  hideToggleButton: PropTypes.bool,
 };
 
 module.exports = TabboxPanel;