diff --git a/lib/Db/Acl.php b/lib/Db/Acl.php
index afb55666b..fc5552b7a 100644
--- a/lib/Db/Acl.php
+++ b/lib/Db/Acl.php
@@ -21,12 +21,9 @@
  *  
  */
 
-// db/author.php
 namespace OCA\Deck\Db;
 
-use JsonSerializable;
-
-class Acl extends Entity implements JsonSerializable {
+class Acl extends Entity implements \JsonSerializable {
 
 	const PERMISSION_READ = 0;
 	const PERMISSION_EDIT = 1;
diff --git a/lib/Service/BoardService.php b/lib/Service/BoardService.php
index 522e24922..9ac6ca3dc 100644
--- a/lib/Service/BoardService.php
+++ b/lib/Service/BoardService.php
@@ -26,7 +26,7 @@ namespace OCA\Deck\Service;
 use OCA\Deck\Db\Acl;
 use OCA\Deck\Db\AclMapper;
 use OCA\Deck\Db\Label;
-use OCP\IGroupManager;
+
 use OCP\ILogger;
 use OCP\IL10N;
 
diff --git a/lib/Service/LabelService.php b/lib/Service/LabelService.php
index e339aabeb..a25c023d4 100644
--- a/lib/Service/LabelService.php
+++ b/lib/Service/LabelService.php
@@ -31,7 +31,6 @@ use OCA\Deck\Db\LabelMapper;
 class LabelService  {
 
     private $labelMapper;
-    private $logger;
 
     public function __construct(
         LabelMapper $labelMapper,
diff --git a/lib/Service/PermissionService.php b/lib/Service/PermissionService.php
index 6d3981342..320e19578 100644
--- a/lib/Service/PermissionService.php
+++ b/lib/Service/PermissionService.php
@@ -26,7 +26,7 @@ namespace OCA\Deck\Service;
 use OCA\Deck\Db\Acl;
 use OCA\Deck\Db\AclMapper;
 use OCA\Deck\Db\BoardMapper;
-use OCA\Deck\Db\Entity;
+
 use OCA\Deck\Db\IPermissionMapper;
 use OCA\Deck\NoPermissionException;
 use OCA\Deck\NotFoundException;