diff --git src/wp-admin/includes/revision.php src/wp-admin/includes/revision.php
index 496282529c..9c4df8a943 100644
--- src/wp-admin/includes/revision.php
+++ src/wp-admin/includes/revision.php
@@ -281,7 +281,7 @@ function wp_prepare_revisions_for_js( $post, $selected_revision_id, $from = null
 		$revisions[ $post->ID ] = array(
 			'id'         => $post->ID,
 			'title'      => get_the_title( $post->ID ),
-			'author'     => $authors[ $post->post_author ],
+			'author'     => $authors[ $revision->post_author ],
 			'date'       => date_i18n( __( 'M j, Y @ H:i' ), strtotime( $post->post_modified ) ),
 			'dateShort'  => date_i18n( _x( 'j M @ H:i', 'revision date short format' ), strtotime( $post->post_modified ) ),
 			/* translators: %s: Human-readable time difference. */