diff --git a/e2e/external-edit.test.ts b/e2e/external-edit.test.ts
index d12e9090..824d662b 100644
--- a/e2e/external-edit.test.ts
+++ b/e2e/external-edit.test.ts
@@ -5,6 +5,7 @@ import { join } from "node:path";
 import {
   gotoSilverBulletPage,
   mod,
+  redoChord,
   spawnServerProcess,
   test,
   waitForServer,
@@ -120,7 +121,7 @@ test("undo after moving the cursor past an external edit restores the user's cur
       selection: { anchor: 3 },
     });
   });
-  await sbPage.keyboard.press(`${mod}+Shift+z`);
+  await sbPage.keyboard.press(redoChord);
   await expect(editor).toContainText("External line");
   const afterRedo = await sbPage.evaluate(
     () => (globalThis as any).client.editorView.state.selection.main.head,
diff --git a/e2e/fixtures.ts b/e2e/fixtures.ts
index c1f543ec..6314ff39 100644
--- a/e2e/fixtures.ts
+++ b/e2e/fixtures.ts
@@ -8,6 +8,15 @@ import { test as base, type Page } from "@playwright/test";
 /** The platform-appropriate modifier key: Meta on macOS, Control elsewhere. */
 export const mod = platform() === "darwin" ? "Meta" : "Control";
 
+/**
+ * Full redo chord, per the "Editor: Redo" binding in editor_commands.ts:
+ * Cmd-Shift-z on macOS, Ctrl-y elsewhere. `${mod}+Shift+z` is NOT a redo
+ * anywhere but macOS -- it silently does nothing on Linux.
+ */
+export const redoChord = platform() === "darwin"
+  ? "Meta+Shift+z"
+  : "Control+y";
+
 /** The admin account every multi-space e2e test provisions via `silverbullet setup`. */
 export const ADMIN_USER = "admin";
 export const ADMIN_PASSWORD = "adminpw123";