diff --git a/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php b/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
index c38bd45928..d3f665de12 100644
--- a/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
+++ b/src/wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php
@@ -344,7 +344,7 @@ class WP_REST_Revisions_Controller extends WP_REST_Controller {
 		$data = array();
 
 		if ( ! empty( $schema['properties']['author'] ) ) {
-			$data['author'] = $post->post_author;
+			$data['author'] = (int) $post->post_author;
 		}
 
 		if ( ! empty( $schema['properties']['date'] ) ) {
diff --git a/tests/phpunit/tests/rest-api/rest-revisions-controller.php b/tests/phpunit/tests/rest-api/rest-revisions-controller.php
index 3c88c6fa0e..455700438b 100644
--- a/tests/phpunit/tests/rest-api/rest-revisions-controller.php
+++ b/tests/phpunit/tests/rest-api/rest-revisions-controller.php
@@ -27,8 +27,10 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 			'role' => 'contributor',
 		) );
 
+		wp_set_current_user( self::$editor_id );
 		wp_update_post( array( 'post_content' => 'This content is better.', 'ID' => self::$post_id ) );
 		wp_update_post( array( 'post_content' => 'This content is marvelous.', 'ID' => self::$post_id ) );
+		wp_set_current_user( 0 );
 	}
 
 	public static function wpTearDownAfterClass() {
@@ -136,6 +138,7 @@ class WP_Test_REST_Revisions_Controller extends WP_Test_REST_Controller_Testcase
 		);
 		$data = $response->get_data();
 		$this->assertEqualSets( $fields, array_keys( $data ) );
+		$this->assertSame( self::$editor_id, $data['author'] );
 	}
 
 	public function test_get_item_embed_context() {