diff --git a/packages/loop-js/src/cli/cron/wrapper.percent.test.ts b/packages/loop-js/src/cli/cron/wrapper.percent.test.ts
new file mode 100644
index 0000000..9db610e
--- /dev/null
+++ b/packages/loop-js/src/cli/cron/wrapper.percent.test.ts
@@ -0,0 +1,17 @@
+import { expect, test } from "bun:test"
+import { cmdWrapper } from "./wrapper.ts"
+
+const AT = 1_700_000_000
+
+test("cmd wrapper escapes literal percent signs in generated path and argv literals", () => {
+  const text = cmdWrapper(
+    { id: "abc123", dir: "C:\\work\\%TEMP%\\proj", until: { settled: false } },
+    ["C:\\tools\\100%\\bun.exe", "C:\\cli\\loop%20cli.ts"],
+    AT,
+  )
+
+  expect(text).toContain('cd /d "C:\\work\\%%TEMP%%\\proj" || exit /b 1')
+  expect(text).toContain('"C:\\tools\\100%%\\bun.exe" "C:\\cli\\loop%%20cli.ts" "run"')
+  expect(text).toContain('>> "C:\\work\\%%TEMP%%\\proj\\.loop\\cron\\abc123.log" 2>&1')
+  expect(text).not.toContain('"C:\\work\\%TEMP%\\proj"')
+})
diff --git a/packages/loop-js/src/cli/cron/wrapper.ts b/packages/loop-js/src/cli/cron/wrapper.ts
index 54a687d..d0bf306 100644
--- a/packages/loop-js/src/cli/cron/wrapper.ts
+++ b/packages/loop-js/src/cli/cron/wrapper.ts
@@ -131,7 +131,9 @@ exit $rc
 export function cmdWrapper(entry: Pick<Entry, "id" | "dir" | "until">, cli: string[], installedAt: number): string {
   const { id, dir, until } = entry
   const log = file(dir, id, "\\", ".log")
-  const q = (s: string) => `"${s}"`
+  // `%...%` and `%0`-`%9` are substitutions even inside quotes in batch files. `%%` emits a
+  // literal percent sign, so filesystem/argv strings survive paths such as `C:\work\%TEMP%`.
+  const q = (s: string) => `"${s.replaceAll("%", "%%")}"`
   const argv = (sub: string[]) => [...cli, ...sub].map(q).join(" ")
   const run = `${argv(["run"])} >> ${q(log)} 2>&1`
   const remove = `${argv(["cron", "remove", id])} >> ${q(log)} 2>&1`