diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d965166..dc2312de 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## 4.0.5
 
+### Bug fixes
+- User-defined types not normalized properly when passed in as data (#4632)
+
 ### Translations
 - Czech: Add missing commas and periods (#5052)
 - Spanish: Update the 'errorLoading' message (#5032)
diff --git a/src/js/select2/data/select.js b/src/js/select2/data/select.js
index b36b9760..abad2a05 100644
--- a/src/js/select2/data/select.js
+++ b/src/js/select2/data/select.js
@@ -244,7 +244,7 @@ define([
   };
 
   SelectAdapter.prototype._normalizeItem = function (item) {
-    if(item !== Object(item)){
+    if (item !== Object(item)) {
       item = {
         id: item,
         text: item
diff --git a/tests/data/array-tests.js b/tests/data/array-tests.js
index cbea97c5..08b806ae 100644
--- a/tests/data/array-tests.js
+++ b/tests/data/array-tests.js
@@ -4,12 +4,12 @@ var ArrayData = require('select2/data/array');
 var $ = require('jquery');
 var Options = require('select2/options');
 
-var UserDefinedType = function( id, text ){
-  var self=this;
+var UserDefinedType = function (id, text) {
+  var self = this;
+
+  self.id = id;
+  self.text = text;
 
-  self.id=id;
-  self.text=text;
-  
   return self;
 };
 
diff --git a/tests/data/select-tests.js b/tests/data/select-tests.js
index 30a9b0e1..abb1e484 100644
--- a/tests/data/select-tests.js
+++ b/tests/data/select-tests.js
@@ -491,12 +491,12 @@ test('select option construction accepts id="" (empty string) value',
 test('user-defined types are normalized properly', function (assert) {
   var $select = $('#qunit-fixture .user-defined'),
 
-  UserDefinedType = function( id, text ){
-    var self=this;
+  UserDefinedType = function (id, text) {
+    var self = this;
+
+    self.id = id;
+    self.text = text;
 
-    self.id=id;
-    self.text=text;
-    
     return self;
   };
 
@@ -507,14 +507,14 @@ test('user-defined types are normalized properly', function (assert) {
         text: 'item'
     },
     new UserDefinedType(1, 'aaaaaa')
-];
+  ];
 
   var data = new SelectData($select, selectOptions);
 
   var normalizedItem = data._normalizeItem(testData[0]);
   var normalizedItem2 = data._normalizeItem(testData[1]);
   var normalizedItem3 = data._normalizeItem(testData[2]);
-  
+
   assert.equal(
     testData[0],
     normalizedItem.id,