diff --git a/core/Command/TwoFactorAuth/Base.php b/core/Command/TwoFactorAuth/Base.php
index fe817d214b..c534065653 100644
--- a/core/Command/TwoFactorAuth/Base.php
+++ b/core/Command/TwoFactorAuth/Base.php
@@ -28,7 +28,7 @@ use OCP\IUser;
 use Stecman\Component\Symfony\Console\BashCompletion\Completion\CompletionAwareInterface;
 use Stecman\Component\Symfony\Console\BashCompletion\CompletionContext;
 
-class Base extends \OC\Core\Command\Base implements CompletionAwareInterface {
+class Base extends \OC\Core\Command\Base {
 
 	/** @var IUserManager */
 	protected $userManager;
diff --git a/lib/private/App/CodeChecker/DeprecationCheck.php b/lib/private/App/CodeChecker/DeprecationCheck.php
index 95d0762e09..72b3712f54 100644
--- a/lib/private/App/CodeChecker/DeprecationCheck.php
+++ b/lib/private/App/CodeChecker/DeprecationCheck.php
@@ -23,7 +23,7 @@
 
 namespace OC\App\CodeChecker;
 
-class DeprecationCheck extends AbstractCheck implements ICheck {
+class DeprecationCheck extends AbstractCheck {
 	/**
 	 * @return string
 	 */
diff --git a/lib/private/App/CodeChecker/PrivateCheck.php b/lib/private/App/CodeChecker/PrivateCheck.php
index 5d160b8f32..f6b5fb4fb1 100644
--- a/lib/private/App/CodeChecker/PrivateCheck.php
+++ b/lib/private/App/CodeChecker/PrivateCheck.php
@@ -22,7 +22,7 @@
 
 namespace OC\App\CodeChecker;
 
-class PrivateCheck extends AbstractCheck implements ICheck {
+class PrivateCheck extends AbstractCheck {
 	/**
 	 * @return string
 	 */