diff --git a/lodash.js b/lodash.js
index d022e6ccb..fb561d94a 100644
--- a/lodash.js
+++ b/lodash.js
@@ -6730,8 +6730,8 @@
       if (reLeadingDot.test(string)) {
         result.push('');
       }
-      string.replace(rePropName, function(match, number, quote, string) {
-        result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
+      string.replace(rePropName, function(match, number, quote, subString) {
+        result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match));
       });
       return result;
     });