diff --git a/dist/handlebars.js b/dist/handlebars.js
index 3cfb57d4c..39afa6419 100644
--- a/dist/handlebars.js
+++ b/dist/handlebars.js
@@ -152,11 +152,7 @@ Handlebars.registerHelper('if', function(context, options) {
 });
 
 Handlebars.registerHelper('unless', function(context, options) {
-  var fn = options.fn, inverse = options.inverse;
-  options.fn = inverse;
-  options.inverse = fn;
-
-  return Handlebars.helpers['if'].call(this, context, options);
+  return Handlebars.helpers['if'].call(this, context, {fn: options.inverse, inverse: options.fn});
 });
 
 Handlebars.registerHelper('with', function(context, options) {
diff --git a/dist/handlebars.runtime.js b/dist/handlebars.runtime.js
index c604a21e1..a55b30fd4 100644
--- a/dist/handlebars.runtime.js
+++ b/dist/handlebars.runtime.js
@@ -152,11 +152,7 @@ Handlebars.registerHelper('if', function(context, options) {
 });
 
 Handlebars.registerHelper('unless', function(context, options) {
-  var fn = options.fn, inverse = options.inverse;
-  options.fn = inverse;
-  options.inverse = fn;
-
-  return Handlebars.helpers['if'].call(this, context, options);
+  return Handlebars.helpers['if'].call(this, context, {fn: options.inverse, inverse: options.fn});
 });
 
 Handlebars.registerHelper('with', function(context, options) {
diff --git a/lib/handlebars/base.js b/lib/handlebars/base.js
index a5fbeed48..dcbd95889 100644
--- a/lib/handlebars/base.js
+++ b/lib/handlebars/base.js
@@ -129,11 +129,7 @@ Handlebars.registerHelper('if', function(context, options) {
 });
 
 Handlebars.registerHelper('unless', function(context, options) {
-  var fn = options.fn, inverse = options.inverse;
-  options.fn = inverse;
-  options.inverse = fn;
-
-  return Handlebars.helpers['if'].call(this, context, options);
+  return Handlebars.helpers['if'].call(this, context, {fn: options.inverse, inverse: options.fn});
 });
 
 Handlebars.registerHelper('with', function(context, options) {