diff --git a/CHANGELOG.md b/CHANGELOG.md
index a60a8399..8fae367b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+### 4.0.18
+### Fixed
+- Fixed user field sources not being exported
+
 ### 4.0.17 - 2018-09-24
 ### Fixed
 - Fixed backwards compatibility of element index mapper
diff --git a/composer.json b/composer.json
index efffb876..4da763e9 100644
--- a/composer.json
+++ b/composer.json
@@ -1,5 +1,5 @@
 {
-    "version": "4.0.17",
+    "version": "4.0.18",
     "name": "nerds-and-company/schematic",
     "description": "Craft setup and sync tool",
     "type": "craft-plugin",
diff --git a/src/Behaviors/SourcesBehavior.php b/src/Behaviors/SourcesBehavior.php
index 3f969fdd..c2d3a8d4 100644
--- a/src/Behaviors/SourcesBehavior.php
+++ b/src/Behaviors/SourcesBehavior.php
@@ -7,6 +7,7 @@
 use yii\base\Behavior;
 use craft\base\Model;
 use craft\records\VolumeFolder;
+use craft\fields\Users;
 use NerdsAndCompany\Schematic\Schematic;
 use NerdsAndCompany\Schematic\Events\SourceMappingEvent;
 
@@ -123,7 +124,7 @@ public function getSource(string $fieldType, string $source = null, string $inde
                 break;
             case 'group':
             case 'editCategories':
-                $service = 'Users' == $fieldType ? Craft::$app->userGroups : Craft::$app->categories;
+                $service = Users::class == $fieldType ? Craft::$app->userGroups : Craft::$app->categories;
                 $method = 'getGroupBy';
                 break;
             case 'folder':