diff --git a/lib/6to5/types/index.js b/lib/6to5/types/index.js
index 8d56f4aa2d..a3bbd5e55f 100644
--- a/lib/6to5/types/index.js
+++ b/lib/6to5/types/index.js
@@ -269,7 +269,7 @@ t.isReferenced = function (node, parent) {
   }
 
   if (t.isCatchClause(parent)) {
-    return parent.param !== node
+    return parent.param !== node;
   }
 
   if (t.isVariableDeclarator(parent)) {