diff --git a/lib/nodes.js b/lib/nodes.js
index 3383eb2a..93d80122 100644
--- a/lib/nodes.js
+++ b/lib/nodes.js
@@ -1496,7 +1496,7 @@
       return "(" + (tests.join(' || ')) + ")";
     };
     In.prototype.compileLoopTest = function(o) {
-      return "" + (utility('inArray')) + "(" + (this.array.compile(o)) + ", " + (this.object.compile(o)) + ")";
+      return "" + (utility('inArray')) + "(" + (this.object.compile(o)) + ", " + (this.array.compile(o)) + ")";
     };
     return In;
   })();
@@ -1962,7 +1962,7 @@
   UTILITIES = {
     "extends": 'function(child, parent) {\n  function ctor() { this.constructor = child; }\n  ctor.prototype = parent.prototype;\n  child.prototype = new ctor;\n  if (typeof parent.extended === "function") parent.extended(child);\n  child.__super__ = parent.prototype;\n}',
     bind: 'function(func, context) {\n  return function() { return func.apply(context, arguments); };\n}',
-    inArray: '(function() {\n  var indexOf = Array.prototype.indexOf || function(item) {\n    var i = this.length; while (i--) if (this[i] === item) return i;\n    return -1;\n  };\n  return function(array, item) { return indexOf.call(array, item) > -1; };\n})();',
+    inArray: '(function() {\n  var indexOf = Array.prototype.indexOf || function(item) {\n    var i = this.length; while (i--) if (this[i] === item) return i;\n    return -1;\n  };\n  return function(item, array) { return indexOf.call(array, item) > -1; };\n})();',
     hasProp: 'Object.prototype.hasOwnProperty',
     slice: 'Array.prototype.slice'
   };
diff --git a/src/nodes.coffee b/src/nodes.coffee
index d0acfa13..99e372a4 100644
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -1269,7 +1269,7 @@ exports.In = class In extends Base
     "(#{tests.join(' || ')})"
 
   compileLoopTest: (o) ->
-    "#{utility 'inArray'}(#{@array.compile o}, #{@object.compile o})"
+    "#{utility 'inArray'}(#{@object.compile o}, #{@array.compile o})"
 
 #### Try
 
@@ -1678,7 +1678,7 @@ UTILITIES =
         var i = this.length; while (i--) if (this[i] === item) return i;
         return -1;
       };
-      return function(array, item) { return indexOf.call(array, item) > -1; };
+      return function(item, array) { return indexOf.call(array, item) > -1; };
     })();
   '''