diff --git a/dom/workers/WorkerPrefs.h b/dom/workers/WorkerPrefs.h
index a8a1e61f4f..415435cf06 100644
--- a/dom/workers/WorkerPrefs.h
+++ b/dom/workers/WorkerPrefs.h
@@ -26,7 +26,6 @@ WORKER_SIMPLE_PREF("browser.dom.window.dump.enabled", DumpEnabled, DUMP)
 WORKER_SIMPLE_PREF("canvas.imagebitmap_extensions.enabled", ImageBitmapExtensionsEnabled, IMAGEBITMAP_EXTENSIONS_ENABLED)
 WORKER_SIMPLE_PREF("dom.caches.enabled", DOMCachesEnabled, DOM_CACHES)
 WORKER_SIMPLE_PREF("dom.caches.testing.enabled", DOMCachesTestingEnabled, DOM_CACHES_TESTING)
-WORKER_SIMPLE_PREF("dom.min_timeout_value", DOMMinTimeoutValue, DOM_MIN_TIMEOUT_VALUE)
 WORKER_SIMPLE_PREF("dom.performance.enable_user_timing_logging", PerformanceLoggingEnabled, PERFORMANCE_LOGGING_ENABLED)
 WORKER_SIMPLE_PREF("dom.webnotifications.enabled", DOMWorkerNotificationEnabled, DOM_WORKERNOTIFICATION)
 WORKER_SIMPLE_PREF("dom.webnotifications.serviceworker.enabled", DOMServiceWorkerNotificationEnabled, DOM_SERVICEWORKERNOTIFICATION)
diff --git a/dom/workers/WorkerPrivate.cpp b/dom/workers/WorkerPrivate.cpp
index 9c52c789cc..85bcc2ffef 100644
--- a/dom/workers/WorkerPrivate.cpp
+++ b/dom/workers/WorkerPrivate.cpp
@@ -171,6 +171,8 @@ const nsIID kDEBUGWorkerEventTargetIID = {
 
 // The number of nested timeouts before we start clamping. HTML says 5.
 const uint32_t kClampTimeoutNestingLevel = 5u;
+// The minimum interval we clamp timers in workers to. HTML says 4ms.
+const uint32_t kClampTimeoutInterval = 4u;
 
 template <class T>
 class AutoPtrComparator
@@ -1997,20 +1999,10 @@ struct WorkerPrivate::TimeoutInfo
 
   void CalculateTargetTime(JSContext* aCx) {
     auto target = mInterval;
-    int32_t minTimeoutValue;
-    
-    // We're on a worker thread; go through WorkerPrivate for the pref.
-    WorkerPrivate* workerPrivate = GetWorkerPrivateFromContext(aCx);
-    if (workerPrivate) {
-      minTimeoutValue = workerPrivate->DOMMinTimeoutValue();
-    } else {
-      // fall back to default 4 ms
-      minTimeoutValue = 4;
-    }
-      
+
     // Clamp timeout for workers, except chrome workers
     if (mNestingLevel >= kClampTimeoutNestingLevel && !mOnChromeWorker) {
-      target = TimeDuration::Max(mInterval,TimeDuration::FromMilliseconds(minTimeoutValue));
+      target = TimeDuration::Max(mInterval, TimeDuration::FromMilliseconds(kClampTimeoutInterval));
     }
     mTargetTime = TimeStamp::Now() + target;
   }