diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba6f9bb52..10c67ff83 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 * Undefined array key warnings in various places
+* @-mentions in federated comments being displayed with a line break
 * Fetching replies from the same instance for Enable Mastodon Apps
 * Image captions not being included in the ActivityPub representation when the image is attached to the post
 
diff --git a/includes/transformer/class-comment.php b/includes/transformer/class-comment.php
index f689b8cf2..9b1ec64ff 100644
--- a/includes/transformer/class-comment.php
+++ b/includes/transformer/class-comment.php
@@ -45,44 +45,6 @@ public function change_wp_user_id( $user_id ) {
 		$this->wp_object->user_id = $user_id;
 	}
 
-	/**
-	 * Transforms the WP_Comment object to an ActivityPub Object.
-	 *
-	 * @see \Activitypub\Activity\Base_Object
-	 *
-	 * @return \Activitypub\Activity\Base_Object The ActivityPub Object.
-	 */
-	public function to_object() {
-		$object = parent::to_object();
-
-		$content       = $this->get_content();
-		$at_replies    = '';
-		$reply_context = $this->extract_reply_context( array() );
-
-		foreach ( $reply_context as $acct => $url ) {
-			$at_replies .= sprintf(
-				'<a class="u-mention mention" href="%s">%s</a> ',
-				esc_url( $url ),
-				esc_html( $acct )
-			);
-		}
-
-		$at_replies = trim( $at_replies );
-
-		if ( $at_replies ) {
-			$content = sprintf( '<p>%s</p>%s', $at_replies, $content );
-		}
-
-		$object->set_content( $content );
-		$object->set_content_map(
-			array(
-				$this->get_locale() => $content,
-			)
-		);
-
-		return $object;
-	}
-
 	/**
 	 * Returns the User-URL of the Author of the Post.
 	 *
@@ -107,8 +69,18 @@ protected function get_attributed_to() {
 	 * @return string The content.
 	 */
 	protected function get_content() {
-		$comment = $this->wp_object;
-		$content = $comment->comment_content;
+		$comment  = $this->wp_object;
+		$content  = $comment->comment_content;
+		$mentions = '';
+
+		foreach ( $this->extract_reply_context() as $acct => $url ) {
+			$mentions .= sprintf(
+				'<a rel="mention" class="u-url mention" href="%s">%s</a> ',
+				esc_url( $url ),
+				esc_html( $acct )
+			);
+		}
+		$content = $mentions . $content;
 
 		/**
 		 * Filter the content of the comment.
@@ -258,11 +230,11 @@ function ( $comment_id ) {
 	 * Collect all other Users that participated in this comment-thread
 	 * to send them a notification about the new reply.
 	 *
-	 * @param array $mentions The already mentioned ActivityPub users.
+	 * @param array $mentions Optional. The already mentioned ActivityPub users. Default empty array.
 	 *
 	 * @return array The list of all Repliers.
 	 */
-	public function extract_reply_context( $mentions ) {
+	public function extract_reply_context( $mentions = array() ) {
 		// Check if `$this->wp_object` is a WP_Comment.
 		if ( 'WP_Comment' !== get_class( $this->wp_object ) ) {
 			return $mentions;
@@ -364,4 +336,15 @@ public function get_to() {
 			get_rest_url_by_path( $path ),
 		);
 	}
+
+	/**
+	 * Returns the content map for the comment.
+	 *
+	 * @return array The content map for the comment.
+	 */
+	public function get_content_map() {
+		return array(
+			$this->get_locale() => $this->get_content(),
+		);
+	}
 }
diff --git a/readme.txt b/readme.txt
index bdec5591f..e47085bc2 100644
--- a/readme.txt
+++ b/readme.txt
@@ -138,6 +138,7 @@ For reasons of data protection, it is not possible to see the followers of other
 * Changed: Hide ActivityPub post meta keys from the custom Fields UI
 * Changed: Bumped minimum required PHP version to 7.2
 * Fixed: Undefined array key warnings in various places
+* Fixed: @-mentions in federated comments being displayed with a line break
 * Fixed: Fetching replies from the same instance for Enable Mastodon Apps
 * Fixed: Image captions not being included in the ActivityPub representation when the image is attached to the post
 
diff --git a/tests/includes/transformer/class-test-comment.php b/tests/includes/transformer/class-test-comment.php
index a4a3efd73..f7dd29559 100644
--- a/tests/includes/transformer/class-test-comment.php
+++ b/tests/includes/transformer/class-test-comment.php
@@ -89,7 +89,7 @@ public function test_content_with_reply_context() {
 		$content = $object->get_content();
 
 		// Test that reply context is added.
-		$this->assertEquals( '<p><a class="u-mention mention" href="https://example.net/@remote">@remote@example.net</a> <a class="u-mention mention" href="https://remote.example/@author">@author@remote.example</a></p><p>This is a comment</p>', $content );
+		$this->assertSame( '<p><a rel="mention" class="u-url mention" href="https://example.net/@remote">@remote@example.net</a> <a rel="mention" class="u-url mention" href="https://remote.example/@author">@author@remote.example</a> This is a comment</p>', $content );
 
 		// Clean up.
 		wp_delete_comment( $reply_comment_id, true );