diff --git a/ts/routes/reviewer/reviewer.ts b/ts/routes/reviewer/reviewer.ts
index 7d6729499..a5ba0fa05 100644
--- a/ts/routes/reviewer/reviewer.ts
+++ b/ts/routes/reviewer/reviewer.ts
@@ -113,7 +113,7 @@ export class ReviewerState {
             case "z": {
                 if (ctrl) {
                     if (shift) {
-                        redo({});
+                        await redo({});
                     } else {
                         await undo({});
                     }