diff --git a/lib/js-file.js b/lib/js-file.js
index 19cc40cf6..cd2617a9d 100644
--- a/lib/js-file.js
+++ b/lib/js-file.js
@@ -566,7 +566,7 @@ JsFile.prototype = {
      * @param {object} tokenAfter
      * @return {Boolean}
      */
-    isOnTheSameLine(tokenBefore, tokenAfter) {
+    isOnTheSameLine: function(tokenBefore, tokenAfter) {
         if (tokenBefore === tokenAfter) {
             return true;
         }
@@ -585,7 +585,7 @@ JsFile.prototype = {
         return false;
     },
 
-    getDistanceBetween(tokenBefore, tokenAfter) {
+    getDistanceBetween: function(tokenBefore, tokenAfter) {
         if (tokenBefore === tokenAfter) {
             return 0;
         }
@@ -604,7 +604,7 @@ JsFile.prototype = {
         return distance;
     },
 
-    getLineCountBetween(tokenBefore, tokenAfter) {
+    getLineCountBetween: function(tokenBefore, tokenAfter) {
         if (tokenBefore === tokenAfter) {
             return 0;
         }