diff --git a/moo.js b/moo.js
index 64ffc33..335d5c0 100644
--- a/moo.js
+++ b/moo.js
@@ -278,8 +278,7 @@
           }
           for (var k = 0; k < newRules.length; k++) {
             var newRule = newRules[k]
-            var l = rules.indexOf(newRule)
-            if (l !== -1) continue
+            if (rules.indexOf(newRule) !== -1) continue
             splice.push(newRule)
           }
         }