diff --git a/src/FileAttachmentField.php b/src/FileAttachmentField.php
index 3120b23..25182c8 100644
--- a/src/FileAttachmentField.php
+++ b/src/FileAttachmentField.php
@@ -552,7 +552,7 @@ public function setValue($val, $data = array())
             if ($data->hasOneComponent($fieldName)) {
                 $id = $data->{$fieldName.'ID'};
                 if ($id) {
-                    $ids[] = $id; 
+                    $ids[] = $id;
                 }
             } else if ($data->hasManyComponent($fieldName) || $data->manyManyComponent($fieldName)) {
                 $files = $data->{$fieldName}();
@@ -561,7 +561,7 @@ public function setValue($val, $data = array())
                         if (!$file->exists()) {
                             continue;
                         }
-                        $ids[] = $file->ID; 
+                        $ids[] = $file->ID;
                     }
                 }
             }
@@ -862,7 +862,7 @@ public function isCMS()
     {
         return Controller::curr() instanceof LeftAndMain;
     }
-    
+
     /**
      * @note   these are user-friendlier versions of internal PHP errors reported back in the ['error'] value of an upload
      * @return string
@@ -914,7 +914,7 @@ private function getUploadUserError($code)
      */
     public function upload(HTTPRequest $request)
     {
-      
+
         $name = $this->getSetting('paramName');
         $files = (!empty($_FILES[$name]) ? $_FILES[$name] : array());
         $tmpFiles = array();
@@ -924,14 +924,14 @@ public function upload(HTTPRequest $request)
             $error_message = _t('FileAttachmentField.UPLOADFORBIDDEN', 'Files cannot be uploaded via this form at the current time.');
             return $this->httpError(403, $error_message);
         }
-        
+
         // No files detected in the upload, this can occur if post_max_size is < the upload size
         $value = $request->postVar($name);
         if(empty($files) || empty($value)) {
             $error_message = _t('FileAttachmentField.NOFILESUPLOADED', 'No files were detected in your upload. Please try again later.');
             return $this->httpError(400, $error_message);
         }
-        
+
         // Security token check, must go after above check as a low post_max_size can scrub the Security Token name from the request
         $form = $this->getForm();
         if($form) {
@@ -1312,8 +1312,8 @@ public function getFileClass($filename = null)
         }
 
         if($filename) {
-            if($defaultClass == "Image" 
-                && $this->config()->upgrade_images 
+            if($defaultClass == Image::class 
+                && $this->config()->upgrade_images
                 && !Injector::inst()->get($class) instanceof Image
             ) {
                 $class = Image::class;