diff --git a/lib/set.js b/lib/set.js
index 3ebfaa1..33ded98 100644
--- a/lib/set.js
+++ b/lib/set.js
@@ -63,7 +63,7 @@ Set.prototype.toArray = function() {
 };
 
 Set.prototype.union = function(other) {
-  var ms = this.members;
+  var ms = this.members
     , u = ownProps(this.members).map(function(k) { return ms[k]; });
   ms = other.members;
   u = u.concat(ownProps(ms).map(function(k) { return ms[k]; }));