diff --git a/src/Api/Serializer/DiscussionSerializer.php b/src/Api/Serializer/DiscussionSerializer.php
index e8f3df822..38900a1ce 100644
--- a/src/Api/Serializer/DiscussionSerializer.php
+++ b/src/Api/Serializer/DiscussionSerializer.php
@@ -38,7 +38,7 @@ class DiscussionSerializer extends BasicDiscussionSerializer
 
         $attributes = parent::getDefaultAttributes($discussion) + [
             'commentCount'      => (int) $discussion->comment_count,
-            'participantsCount' => (int) $discussion->participant_count,
+            'participantCount'  => (int) $discussion->participant_count,
             'startTime'         => $this->formatDate($discussion->created_at),
             'lastTime'          => $this->formatDate($discussion->last_posted_at),
             'lastPostNumber'    => (int) $discussion->last_post_number,
diff --git a/src/Discussion/Discussion.php b/src/Discussion/Discussion.php
index cce9f1aa1..60d529b6d 100644
--- a/src/Discussion/Discussion.php
+++ b/src/Discussion/Discussion.php
@@ -242,11 +242,11 @@ class Discussion extends AbstractModel
     }
 
     /**
-     * Refresh the discussion's participants count.
+     * Refresh the discussion's participant count.
      *
      * @return $this
      */
-    public function refreshParticipantsCount()
+    public function refreshParticipantCount()
     {
         $this->participant_count = $this->participants()->count('users.id');
 
diff --git a/src/Discussion/DiscussionMetadataUpdater.php b/src/Discussion/DiscussionMetadataUpdater.php
index cb89a40c7..27a162fd0 100644
--- a/src/Discussion/DiscussionMetadataUpdater.php
+++ b/src/Discussion/DiscussionMetadataUpdater.php
@@ -41,7 +41,7 @@ class DiscussionMetadataUpdater
         if ($discussion && $discussion->exists) {
             $discussion->refreshCommentCount();
             $discussion->refreshLastPost();
-            $discussion->refreshParticipantsCount();
+            $discussion->refreshParticipantCount();
             $discussion->save();
         }
     }
@@ -77,7 +77,7 @@ class DiscussionMetadataUpdater
 
         if ($discussion && $discussion->exists) {
             $discussion->refreshCommentCount();
-            $discussion->refreshParticipantsCount();
+            $discussion->refreshParticipantCount();
             $discussion->refreshLastPost();
             $discussion->save();
         }
@@ -92,7 +92,7 @@ class DiscussionMetadataUpdater
 
         if ($discussion && $discussion->exists) {
             $discussion->refreshCommentCount();
-            $discussion->refreshParticipantsCount();
+            $discussion->refreshParticipantCount();
 
             if ($discussion->last_post_id == $post->id) {
                 $discussion->refreshLastPost();