diff --git a/package-lock.json b/package-lock.json
index 85676cc..f02f6d6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,6 +9,7 @@
       "version": "11.5.3",
       "license": "BlueOak-1.0.0",
       "devDependencies": {
+        "@tapjs/clock": "^3.3.10",
         "benchmark": "^2.1.4",
         "esbuild": "^0.28.0",
         "marked": "^4.2.12",
@@ -1465,6 +1466,23 @@
         "@tapjs/core": "4.5.8"
       }
     },
+    "node_modules/@tapjs/clock": {
+      "version": "3.3.10",
+      "resolved": "https://registry.npmjs.org/@tapjs/clock/-/clock-3.3.10.tgz",
+      "integrity": "sha512-BO0qHEbEX0oR5wK0JH8LFc0I00I2M4nyQPNq529EBJks7dyfFzcS6VeBV5YRnlHv2FdSXiqI4OzdJhpCbeUuIA==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "dependencies": {
+        "@tapjs/after": "3.3.10",
+        "clock-mock": "^2.0.2"
+      },
+      "engines": {
+        "node": "20 || >=22"
+      },
+      "peerDependencies": {
+        "@tapjs/core": "4.5.8"
+      }
+    },
     "node_modules/@tapjs/config": {
       "version": "5.6.4",
       "resolved": "https://registry.npmjs.org/@tapjs/config/-/config-5.6.4.tgz",
@@ -2543,6 +2561,16 @@
         "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
       }
     },
+    "node_modules/clock-mock": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/clock-mock/-/clock-mock-2.0.4.tgz",
+      "integrity": "sha512-y54bFfYHLME1IF/rwPa7uF0+oYmozUXu9AKyAc9HsS3I4uQp8cyi7AxNQABxuniDnCg1hyGk+0KXORPooombGg==",
+      "dev": true,
+      "license": "BlueOak-1.0.0",
+      "engines": {
+        "node": ">=16.17"
+      }
+    },
     "node_modules/code-excerpt": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/code-excerpt/-/code-excerpt-4.0.0.tgz",
diff --git a/package.json b/package.json
index 6f54392..5b7add1 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
   "scripts": {
     "build": "npm run prepare",
     "prepare": "tshy && bash scripts/build.sh",
-    "pretest": "npm run prepare",
+    "pretest": "npm run prepare && tap build",
     "presnap": "npm run prepare",
     "test": "tap",
     "snap": "tap",
@@ -87,6 +87,7 @@
     "url": "git+ssh://git@github.com/isaacs/node-lru-cache.git"
   },
   "devDependencies": {
+    "@tapjs/clock": "^3.3.10",
     "benchmark": "^2.1.4",
     "esbuild": "^0.28.0",
     "marked": "^4.2.12",
diff --git a/test/ttl-autopurge-rearm.ts b/test/ttl-autopurge-rearm.ts
new file mode 100644
index 0000000..a3bfd88
--- /dev/null
+++ b/test/ttl-autopurge-rearm.ts
@@ -0,0 +1,27 @@
+import { LRUCache } from 'lru-cache'
+import t from 'tap'
+
+// If the autopurge timer fires before the entry is stale (timer drift,
+// coarse clocks), it must be re-armed instead of dropped. Use a perf
+// clock that only moves when the test says so, so this does not depend
+// on platform timer timing.
+t.test(
+  'autopurge timer re-arms when the entry is not stale yet',
+  async t => {
+    let now = 1000
+    const cache = new LRUCache<string, number>({
+      max: 10,
+      ttl: 10,
+      ttlAutopurge: true,
+      ttlResolution: 0,
+      perf: { now: () => now },
+    })
+    cache.set('a', 1)
+    // timer fires after ~11ms of real time, but the clock has not moved
+    await new Promise(r => setTimeout(r, 50))
+    t.equal(cache.size, 1, 'not purged while not stale')
+    now += 1000
+    await new Promise(r => setTimeout(r, 50))
+    t.equal(cache.size, 0, 'purged by the re-armed timer once stale')
+  },
+)