diff --git a/app/lib/components/ToolArea/ToolAreaButton.jsx b/app/lib/components/ToolArea/ToolAreaButton.jsx
index 14e7d928..ea9fa09b 100644
--- a/app/lib/components/ToolArea/ToolAreaButton.jsx
+++ b/app/lib/components/ToolArea/ToolAreaButton.jsx
@@ -41,7 +41,7 @@ ToolAreaButton.propTypes =
 {
 	toolAreaOpen   : PropTypes.bool.isRequired,
 	toggleToolArea : PropTypes.func.isRequired,
-	unread         : PropTypes.bool.isRequired,
+	unread         : PropTypes.number.isRequired,
 	visible        : PropTypes.bool.isRequired
 };