diff --git a/src/wp-admin/includes/revision.php b/src/wp-admin/includes/revision.php
index 151cd64..17be3d2 100644
--- a/src/wp-admin/includes/revision.php
+++ b/src/wp-admin/includes/revision.php
@@ -92,7 +92,7 @@ function wp_get_revision_ui_diff( $post, $compare_from, $compare_to ) {
 			);
 		}
 	}
-	return $return;
+	return apply_filters( 'wp_get_revision_ui_diff', $return, $compare_from, $compare_to );
 }
 
 /**