diff --git a/modules/backend/widgets/MediaManager.php b/modules/backend/widgets/MediaManager.php
index 31a4229a0..bf10a2025 100644
--- a/modules/backend/widgets/MediaManager.php
+++ b/modules/backend/widgets/MediaManager.php
@@ -4,7 +4,6 @@ use Url;
 use Str;
 use Lang;
 use File;
-use Form;
 use Input;
 use Config;
 use Request;
@@ -500,7 +499,7 @@ class MediaManager extends WidgetBase
     {
         $path = Input::get('path');
         $path = MediaLibrary::validatePath($path);
-        $cropSessionKey = md5(Form::getSessionKey());
+        $cropSessionKey = md5(\Form::getSessionKey());
         $selectionParams = $this->getSelectionParams();
 
         $urlAndSize = $this->getCropEditImageUrlAndSize($path, $cropSessionKey);
diff --git a/modules/system/models/MailBrandSetting.php b/modules/system/models/MailBrandSetting.php
index 267592150..070633bb2 100644
--- a/modules/system/models/MailBrandSetting.php
+++ b/modules/system/models/MailBrandSetting.php
@@ -3,7 +3,6 @@
 use App;
 use Url;
 use Str;
-use File;
 use Lang;
 use Model;
 use Cache;
@@ -152,7 +151,7 @@ class MailBrandSetting extends Model
 
         $parser->ModifyVars(static::makeCssVars());
 
-        $parser->parse(File::get($basePath . '/custom.less'));
+        $parser->parse(\File::get($basePath . '/custom.less'));
 
         $css = $parser->getCss();
 
diff --git a/modules/system/models/MailLayout.php b/modules/system/models/MailLayout.php
index df7065459..c9a21dd12 100644
--- a/modules/system/models/MailLayout.php
+++ b/modules/system/models/MailLayout.php
@@ -1,6 +1,5 @@
 <?php namespace System\Models;
 
-use File;
 use View;
 use Model;
 use System\Classes\MailManager;
@@ -132,6 +131,6 @@ class MailLayout extends Model
 
     protected static function getTemplateSections($code)
     {
-        return MailParser::parse(File::get(View::make($code)->getPath()));
+        return MailParser::parse(\File::get(View::make($code)->getPath()));
     }
 }
diff --git a/modules/system/models/MailPartial.php b/modules/system/models/MailPartial.php
index d0295e06a..7679d1232 100644
--- a/modules/system/models/MailPartial.php
+++ b/modules/system/models/MailPartial.php
@@ -1,7 +1,6 @@
 <?php namespace System\Models;
 
 use Twig;
-use File;
 use View;
 use Model;
 use Markdown;
@@ -116,6 +115,6 @@ class MailPartial extends Model
 
     protected static function getTemplateSections($code)
     {
-        return MailParser::parse(File::get(View::make($code)->getPath()));
+        return MailParser::parse(\File::get(View::make($code)->getPath()));
     }
 }
diff --git a/modules/system/models/MailTemplate.php b/modules/system/models/MailTemplate.php
index 9fbd9fbc0..9f6f0edab 100644
--- a/modules/system/models/MailTemplate.php
+++ b/modules/system/models/MailTemplate.php
@@ -1,7 +1,6 @@
 <?php namespace System\Models;
 
 use App;
-use File;
 use View;
 use Model;
 use System\Classes\MailManager;
@@ -147,7 +146,7 @@ class MailTemplate extends Model
 
     protected static function getTemplateSections($code)
     {
-        return MailParser::parse(File::get(View::make($code)->getPath()));
+        return MailParser::parse(\File::get(View::make($code)->getPath()));
     }
 
     public static function findOrMakeTemplate($code)