diff --git a/src/workerd/server/server.c++ b/src/workerd/server/server.c++
index 9de0e5f5a93c..0ddd5bade4c3 100644
--- a/src/workerd/server/server.c++
+++ b/src/workerd/server/server.c++
@@ -1396,7 +1396,7 @@ public:
           Worker::Lock lock(*service.worker, asyncLock);
           // We define this event ID in the internal codebase, but to have WebSocket Hibernation
           // work for local development we need to pass an event type.
-          uint16_t hibernationEventTypeId = 8;
+          static constexpr uint16_t hibernationEventTypeId = 8;
           auto newActor = kj::refcounted<Worker::Actor>(
               *service.worker, nullptr, kj::str(id), true, kj::mv(makeActorCache),
               className, kj::mv(makeStorage), lock, kj::mv(loopback),