diff --git a/dom/base/DOMPrefsInternal.h b/dom/base/DOMPrefsInternal.h
index a2047b7833d4..b2197e61b438 100644
--- a/dom/base/DOMPrefsInternal.h
+++ b/dom/base/DOMPrefsInternal.h
@@ -19,7 +19,6 @@
 //   * This defines DOMPrefs::FooBar(JSContext* aCx, JSObject* aObj);
 //     This is allows the use of DOMPrefs in WebIDL files.
 
-DOM_PREF(PromiseRejectionEventsEnabled, "dom.promise_rejection_events.enabled")
 DOM_PREF(PushEnabled, "dom.push.enabled")
 DOM_PREF(StreamsEnabled, "dom.streams.enabled")
 DOM_PREF(OffscreenCanvasEnabled, "gfx.offscreencanvas.enabled")
@@ -41,7 +40,7 @@ DOM_WEBIDL_PREF2(dom_webnotifications_serviceworker_enabled)
 DOM_WEBIDL_PREF2(dom_webnotifications_requireinteraction_enabled)
 DOM_WEBIDL_PREF2(dom_serviceWorkers_enabled)
 DOM_WEBIDL_PREF2(dom_storageManager_enabled)
-DOM_WEBIDL_PREF(PromiseRejectionEventsEnabled)
+DOM_WEBIDL_PREF2(dom_promise_rejection_events_enabled)
 DOM_WEBIDL_PREF(PushEnabled)
 DOM_WEBIDL_PREF(StreamsEnabled)
 DOM_WEBIDL_PREF(OffscreenCanvasEnabled)
diff --git a/dom/webidl/PromiseRejectionEvent.webidl b/dom/webidl/PromiseRejectionEvent.webidl
index a341794cf916..c03f3ae0310e 100644
--- a/dom/webidl/PromiseRejectionEvent.webidl
+++ b/dom/webidl/PromiseRejectionEvent.webidl
@@ -6,7 +6,7 @@
 
 [Constructor(DOMString type, PromiseRejectionEventInit eventInitDict),
  Exposed=(Window,Worker),
- Func="mozilla::dom::DOMPrefs::PromiseRejectionEventsEnabled"]
+ Func="mozilla::dom::DOMPrefs::dom_promise_rejection_events_enabled"]
 interface PromiseRejectionEvent : Event
 {
   [BinaryName="rejectedPromise"]
diff --git a/modules/libpref/init/StaticPrefList.h b/modules/libpref/init/StaticPrefList.h
index a0f089cb27f8..a4085f9ee6ae 100644
--- a/modules/libpref/init/StaticPrefList.h
+++ b/modules/libpref/init/StaticPrefList.h
@@ -278,6 +278,15 @@ VARCACHE_PREF(
 )
 #undef PREF_VALUE
 
+// WHATWG promise rejection events. See
+// https://html.spec.whatwg.org/multipage/webappapis.html#promiserejectionevent
+// TODO: Enable the event interface once actually firing it (bug 1362272).
+VARCACHE_PREF(
+  "dom.promise_rejection_events.enabled",
+   dom_promise_rejection_events_enabled,
+  RelaxedAtomicBool, false
+)
+
 //---------------------------------------------------------------------------
 // Clear-Site-Data prefs
 //---------------------------------------------------------------------------
diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 7380ee8a3559..11b93b568af8 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -5171,11 +5171,6 @@ pref("dom.w3c_pointer_events.dispatch_by_pointer_messages", false);
 // W3C pointer events draft
 pref("dom.w3c_pointer_events.implicit_capture", false);
 
-// WHATWG promise rejection events. See
-// https://html.spec.whatwg.org/multipage/webappapis.html#promiserejectionevent
-// TODO: Enable the event interface once actually firing it (bug 1362272).
-pref("dom.promise_rejection_events.enabled", false);
-
 // W3C draft ImageCapture API
 pref("dom.imagecapture.enabled", false);