diff --git a/lib/internal/test_runner/mock/mock_timers.js b/lib/internal/test_runner/mock/mock_timers.js
index 407a671eda7a8c..85512cc4b66a51 100644
--- a/lib/internal/test_runner/mock/mock_timers.js
+++ b/lib/internal/test_runner/mock/mock_timers.js
@@ -260,20 +260,23 @@ class MockTimers {
 
   #createTimer(isInterval, callback, delay, ...args) {
     const timerId = this.#currentTimer++;
-    this.#executionQueue.insert({
+    const timer = {
       __proto__: null,
       id: timerId,
       callback,
       runAt: this.#now + delay,
       interval: isInterval ? delay : undefined,
       args,
-    });
-
-    return timerId;
+    };
+    this.#executionQueue.insert(timer);
+    return timer;
   }
 
-  #clearTimer(position) {
-    this.#executionQueue.removeAt(position);
+  #clearTimer(timer) {
+    if (timer.priorityQueuePosition !== undefined) {
+      this.#executionQueue.removeAt(timer.priorityQueuePosition);
+      timer.priorityQueuePosition = undefined;
+    }
   }
 
   #createDate() {
@@ -397,10 +400,10 @@ class MockTimers {
       emitter.emit('data', result);
     };
 
-    const timerId = this.#createTimer(true, callback, interval, options);
+    const timer = this.#createTimer(true, callback, interval, options);
     const clearListeners = () => {
       emitter.removeAllListeners();
-      context.#clearTimer(timerId);
+      context.#clearTimer(timer);
     };
     const iterator = {
       __proto__: null,
@@ -453,11 +456,11 @@ class MockTimers {
       }
 
       const onabort = () => {
-        clearFn(id);
+        clearFn(timer);
         return reject(abortIt(options.signal));
       };
 
-      const id = timerFn(() => {
+      const timer = timerFn(() => {
         return resolve(result);
       }, ms);
 
@@ -620,6 +623,7 @@ class MockTimers {
       FunctionPrototypeApply(timer.callback, undefined, timer.args);
 
       this.#executionQueue.shift();
+      timer.priorityQueuePosition = undefined;
 
       if (timer.interval !== undefined) {
         timer.runAt += timer.interval;