diff --git a/lib/util/inflector.js b/lib/util/inflector.js
index 0d971ad..cf55b41 100644
--- a/lib/util/inflector.js
+++ b/lib/util/inflector.js
@@ -65,6 +65,7 @@ var inflector = {
 
       while (i--) {
         var rule = rules[i][0];
+        rule.lastIndex = 0;
 
         if(rule.test(word)) {
           return word.replace(rule, rules[i][1]);