diff --git a/files/lib/system/suspension/BanSuspension.class.php b/files/lib/system/suspension/BanSuspension.class.php
index 385defc..40657e0 100644
--- a/files/lib/system/suspension/BanSuspension.class.php
+++ b/files/lib/system/suspension/BanSuspension.class.php
@@ -27,7 +27,7 @@ final class BanSuspension implements ISuspension
     /**
      * @inheritDoc
      */
-    public function hasEffect(Suspension $suspension)
+    public function hasEffect(Suspension $suspension): bool
     {
         $user = new UserProfile($suspension->getUser());
         $room = $suspension->getRoom();
diff --git a/files/lib/system/suspension/MuteSuspension.class.php b/files/lib/system/suspension/MuteSuspension.class.php
index 5de126b..faf26be 100644
--- a/files/lib/system/suspension/MuteSuspension.class.php
+++ b/files/lib/system/suspension/MuteSuspension.class.php
@@ -27,7 +27,7 @@ final class MuteSuspension implements ISuspension
     /**
      * @inheritDoc
      */
-    public function hasEffect(Suspension $suspension)
+    public function hasEffect(Suspension $suspension): bool
     {
         $user = new UserProfile($suspension->getUser());
         $room = $suspension->getRoom();