diff --git a/src/Api/ApiServiceProvider.php b/src/Api/ApiServiceProvider.php
index 7360358a3..f0bdf6659 100644
--- a/src/Api/ApiServiceProvider.php
+++ b/src/Api/ApiServiceProvider.php
@@ -15,6 +15,7 @@ use Flarum\Api\Controller\AbstractSerializeController;
 use Flarum\Api\Middleware\FakeHttpMethods;
 use Flarum\Api\Middleware\HandleErrors;
 use Flarum\Api\Serializer\AbstractSerializer;
+use Flarum\Api\Serializer\BasicDiscussionSerializer;
 use Flarum\Api\Serializer\NotificationSerializer;
 use Flarum\Event\ConfigureApiRoutes;
 use Flarum\Event\ConfigureMiddleware;
@@ -114,7 +115,7 @@ class ApiServiceProvider extends AbstractServiceProvider
     {
         $blueprints = [];
         $serializers = [
-            'discussionRenamed' => 'Flarum\Api\Serializer\DiscussionBasicSerializer'
+            'discussionRenamed' => BasicDiscussionSerializer::class
         ];
 
         $this->app->make('events')->fire(
diff --git a/src/Api/Serializer/BasicDiscussionSerializer.php b/src/Api/Serializer/BasicDiscussionSerializer.php
index b0f39b2fe..b03d6d002 100644
--- a/src/Api/Serializer/BasicDiscussionSerializer.php
+++ b/src/Api/Serializer/BasicDiscussionSerializer.php
@@ -46,7 +46,7 @@ class BasicDiscussionSerializer extends AbstractSerializer
      */
     protected function startUser($discussion)
     {
-        return $this->hasOne($discussion, 'Flarum\Api\Serializer\BasicUserSerializer');
+        return $this->hasOne($discussion, BasicUserSerializer::class);
     }
 
     /**
@@ -54,7 +54,7 @@ class BasicDiscussionSerializer extends AbstractSerializer
      */
     protected function startPost($discussion)
     {
-        return $this->hasOne($discussion, 'Flarum\Api\Serializer\BasicPostSerializer');
+        return $this->hasOne($discussion, BasicPostSerializer::class);
     }
 
     /**
@@ -62,7 +62,7 @@ class BasicDiscussionSerializer extends AbstractSerializer
      */
     protected function lastUser($discussion)
     {
-        return $this->hasOne($discussion, 'Flarum\Api\Serializer\BasicUserSerializer');
+        return $this->hasOne($discussion, BasicUserSerializer::class);
     }
 
     /**
@@ -70,7 +70,7 @@ class BasicDiscussionSerializer extends AbstractSerializer
      */
     protected function lastPost($discussion)
     {
-        return $this->hasOne($discussion, 'Flarum\Api\Serializer\BasicPostSerializer');
+        return $this->hasOne($discussion, BasicPostSerializer::class);
     }
 
     /**
@@ -78,7 +78,7 @@ class BasicDiscussionSerializer extends AbstractSerializer
      */
     protected function posts($discussion)
     {
-        return $this->hasMany($discussion, 'Flarum\Api\Serializer\PostSerializer');
+        return $this->hasMany($discussion, PostSerializer::class);
     }
 
     /**
@@ -86,7 +86,7 @@ class BasicDiscussionSerializer extends AbstractSerializer
      */
     protected function relevantPosts($discussion)
     {
-        return $this->hasMany($discussion, 'Flarum\Api\Serializer\BasicPostSerializer');
+        return $this->hasMany($discussion, BasicPostSerializer::class);
     }
 
     /**
@@ -94,6 +94,6 @@ class BasicDiscussionSerializer extends AbstractSerializer
      */
     protected function hideUser($discussion)
     {
-        return $this->hasOne($discussion, 'Flarum\Api\Serializer\UserBasicSerializer');
+        return $this->hasOne($discussion, BasicUserSerializer::class);
     }
 }
diff --git a/src/Api/Serializer/BasicPostSerializer.php b/src/Api/Serializer/BasicPostSerializer.php
index a2a10feeb..103bd8a06 100644
--- a/src/Api/Serializer/BasicPostSerializer.php
+++ b/src/Api/Serializer/BasicPostSerializer.php
@@ -57,7 +57,7 @@ class BasicPostSerializer extends AbstractSerializer
      */
     protected function user($post)
     {
-        return $this->hasOne($post, 'Flarum\Api\Serializer\BasicUserSerializer');
+        return $this->hasOne($post, BasicUserSerializer::class);
     }
 
     /**
@@ -65,6 +65,6 @@ class BasicPostSerializer extends AbstractSerializer
      */
     protected function discussion($post)
     {
-        return $this->hasOne($post, 'Flarum\Api\Serializer\BasicDiscussionSerializer');
+        return $this->hasOne($post, BasicDiscussionSerializer::class);
     }
 }
diff --git a/src/Api/Serializer/BasicUserSerializer.php b/src/Api/Serializer/BasicUserSerializer.php
index 5e84273d5..3a6b3d46d 100644
--- a/src/Api/Serializer/BasicUserSerializer.php
+++ b/src/Api/Serializer/BasicUserSerializer.php
@@ -47,6 +47,6 @@ class BasicUserSerializer extends AbstractSerializer
      */
     protected function groups($user)
     {
-        return $this->hasMany($user, 'Flarum\Api\Serializer\GroupSerializer');
+        return $this->hasMany($user, GroupSerializer::class);
     }
 }
diff --git a/src/Api/Serializer/ForumSerializer.php b/src/Api/Serializer/ForumSerializer.php
index 399fcfd83..02dcdd6d6 100644
--- a/src/Api/Serializer/ForumSerializer.php
+++ b/src/Api/Serializer/ForumSerializer.php
@@ -97,7 +97,7 @@ class ForumSerializer extends AbstractSerializer
      */
     protected function groups($model)
     {
-        return $this->hasMany($model, 'Flarum\Api\Serializer\GroupSerializer');
+        return $this->hasMany($model, GroupSerializer::class);
     }
 
     /**
diff --git a/src/Api/Serializer/GroupSerializer.php b/src/Api/Serializer/GroupSerializer.php
index 7cd1eb989..7511329cc 100644
--- a/src/Api/Serializer/GroupSerializer.php
+++ b/src/Api/Serializer/GroupSerializer.php
@@ -62,7 +62,7 @@ class GroupSerializer extends AbstractSerializer
      */
     protected function permissions($group)
     {
-        return $this->hasMany($group, 'Flarum\Api\Serializers\PermissionSerializer');
+        return $this->hasMany($group, PermissionSerializer::class);
     }
 
     /**
diff --git a/src/Api/Serializer/NotificationSerializer.php b/src/Api/Serializer/NotificationSerializer.php
index 9159445a3..55b809079 100644
--- a/src/Api/Serializer/NotificationSerializer.php
+++ b/src/Api/Serializer/NotificationSerializer.php
@@ -57,7 +57,7 @@ class NotificationSerializer extends AbstractSerializer
      */
     protected function user($notification)
     {
-        return $this->hasOne($notification, 'Flarum\Api\Serializer\BasicUserSerializer');
+        return $this->hasOne($notification, BasicUserSerializer::class);
     }
 
     /**
@@ -65,7 +65,7 @@ class NotificationSerializer extends AbstractSerializer
      */
     protected function sender($notification)
     {
-        return $this->hasOne($notification, 'Flarum\Api\Serializer\BasicUserSerializer');
+        return $this->hasOne($notification, BasicUserSerializer::class);
     }
 
     /**
diff --git a/src/Api/Serializer/PostSerializer.php b/src/Api/Serializer/PostSerializer.php
index 7843e43ce..ee807374b 100644
--- a/src/Api/Serializer/PostSerializer.php
+++ b/src/Api/Serializer/PostSerializer.php
@@ -77,7 +77,7 @@ class PostSerializer extends BasicPostSerializer
      */
     protected function user($post)
     {
-        return $this->hasOne($post, 'Flarum\Api\Serializer\UserSerializer');
+        return $this->hasOne($post, UserSerializer::class);
     }
 
     /**
@@ -85,7 +85,7 @@ class PostSerializer extends BasicPostSerializer
      */
     protected function discussion($post)
     {
-        return $this->hasOne($post, 'Flarum\Api\Serializer\DiscussionBasicSerializer');
+        return $this->hasOne($post, BasicDiscussionSerializer::class);
     }
 
     /**
@@ -93,7 +93,7 @@ class PostSerializer extends BasicPostSerializer
      */
     protected function editUser($post)
     {
-        return $this->hasOne($post, 'Flarum\Api\Serializer\UserBasicSerializer');
+        return $this->hasOne($post, BasicUserSerializer::class);
     }
 
     /**
@@ -101,6 +101,6 @@ class PostSerializer extends BasicPostSerializer
      */
     protected function hideUser($post)
     {
-        return $this->hasOne($post, 'Flarum\Api\Serializer\UserBasicSerializer');
+        return $this->hasOne($post, BasicUserSerializer::class);
     }
 }