diff --git a/src/wp-includes/comment-functions.php b/src/wp-includes/comment-functions.php
index 6b055d1d22..e1975f62e6 100644
--- a/src/wp-includes/comment-functions.php
+++ b/src/wp-includes/comment-functions.php
@@ -2742,6 +2742,7 @@ function wp_handle_comment_submission( $comment_data ) {
 		$comment_author       = $user->display_name;
 		$comment_author_email = $user->user_email;
 		$comment_author_url   = $user->user_url;
+		$user_id              = $user->ID;
 		if ( current_user_can( 'unfiltered_html' ) ) {
 			if ( ! isset( $comment_data['_wp_unfiltered_html_comment'] )
 				|| ! wp_verify_nonce( $comment_data['_wp_unfiltered_html_comment'], 'unfiltered-html-comment_' . $comment_post_ID )
@@ -2778,7 +2779,7 @@ function wp_handle_comment_submission( $comment_data ) {
 		'comment_content',
 		'comment_type',
 		'comment_parent',
-		'user_ID'
+		'user_id'
 	);
 
 	$comment_id = wp_new_comment( wp_slash( $commentdata ) );
diff --git a/tests/phpunit/tests/comment-submission.php b/tests/phpunit/tests/comment-submission.php
index 548b77b609..b12d7f7e88 100644
--- a/tests/phpunit/tests/comment-submission.php
+++ b/tests/phpunit/tests/comment-submission.php
@@ -176,6 +176,7 @@ class Tests_Comment_Submission extends WP_UnitTestCase {
 		$this->assertSame( $user->display_name, $comment->comment_author );
 		$this->assertSame( $user->user_email, $comment->comment_author_email );
 		$this->assertSame( $user->user_url, $comment->comment_author_url );
+		$this->assertSame( $user->ID, intval( $comment->user_id ) );
 
 	}
 
@@ -198,6 +199,7 @@ class Tests_Comment_Submission extends WP_UnitTestCase {
 		$this->assertSame( 'Comment Author', $comment->comment_author );
 		$this->assertSame( 'comment@example.org', $comment->comment_author_email );
 		$this->assertSame( 'http://user.example.org', $comment->comment_author_url );
+		$this->assertSame( '0', $comment->user_id );
 
 	}