diff --git a/wp-includes/class-wp-xmlrpc-server.php b/wp-includes/class-wp-xmlrpc-server.php
index c34a6a5d28..d22bc5113d 100644
--- a/wp-includes/class-wp-xmlrpc-server.php
+++ b/wp-includes/class-wp-xmlrpc-server.php
@@ -3214,34 +3214,54 @@ class wp_xmlrpc_server extends IXR_Server {
 		$password = $args[2];
 		$struct	  = isset( $args[3] ) ? $args[3] : array();
 
-		if ( ! $user = $this->login($username, $password ) )
+		if ( ! $user = $this->login( $username, $password ) ) {
 			return $this->error;
+		}
 
 		/** This action is documented in wp-includes/class-wp-xmlrpc-server.php */
 		do_action( 'xmlrpc_call', 'wp.getComments' );
 
-		if ( isset( $struct['status'] ) )
+		if ( isset( $struct['status'] ) ) {
 			$status = $struct['status'];
-		else
+		} else {
 			$status = '';
+		}
 
 		if ( ! current_user_can( 'moderate_comments' ) && 'approve' !== $status ) {
 			return new IXR_Error( 401, __( 'Invalid comment status.' ) );
 		}
 
 		$post_id = '';
-		if ( isset($struct['post_id']) )
-			$post_id = absint($struct['post_id']);
+		if ( isset( $struct['post_id'] ) ) {
+			$post_id = absint( $struct['post_id'] );
+		}
+
+		$post_type = '';
+		if ( isset( $struct['post_type'] ) ) {
+			$post_type_object = get_post_type_object( $struct['post_type'] );
+			if ( ! $post_type_object || ! post_type_supports( $post_type_object->name, 'comments' ) ) {
+				return new IXR_Error( 404, __( 'Invalid post type.' ) );
+			}
+			$post_type = $struct['post_type'];
+		}
 
 		$offset = 0;
-		if ( isset($struct['offset']) )
-			$offset = absint($struct['offset']);
+		if ( isset( $struct['offset'] ) ) {
+			$offset = absint( $struct['offset'] );
+		}
 
 		$number = 10;
-		if ( isset($struct['number']) )
-			$number = absint($struct['number']);
+		if ( isset( $struct['number'] ) ) {
+			$number = absint( $struct['number'] );
+		}
 
-		$comments = get_comments( array( 'status' => $status, 'post_id' => $post_id, 'offset' => $offset, 'number' => $number ) );
+		$comments = get_comments( array(
+			'status' => $status,
+			'post_id' => $post_id,
+			'offset' => $offset,
+			'number' => $number,
+			'post_type' => $post_type,
+		) );
 
 		$comments_struct = array();
 		if ( is_array( $comments ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 01c21c299f..6e5cd2c370 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34574';
+$wp_version = '4.4-alpha-34575';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.