diff --git a/js/src/gc/WeakMap-inl.h b/js/src/gc/WeakMap-inl.h
index fe3310af52e0..b1e52aacc8ba 100644
--- a/js/src/gc/WeakMap-inl.h
+++ b/js/src/gc/WeakMap-inl.h
@@ -402,7 +402,8 @@ void WeakMap<K, V>::checkAfterMovingGC() const {
     gc::Cell* value = gc::ToMarkable(r.front().value());
     CheckGCThingAfterMovingGC(key);
     if (!allowKeysInOtherZones()) {
-      MOZ_RELEASE_ASSERT(key->zone() == zone() || key->zone()->isAtomsZone());
+      Zone* keyZone = key->zoneFromAnyThread();
+      MOZ_RELEASE_ASSERT(keyZone == zone() || keyZone->isAtomsZone());
     }
     CheckGCThingAfterMovingGC(value, zone());
     auto ptr = lookupUnbarriered(r.front().key());
diff --git a/js/src/jit-test/tests/gc/bug-1894442.js b/js/src/jit-test/tests/gc/bug-1894442.js
new file mode 100644
index 000000000000..93bedb74debb
--- /dev/null
+++ b/js/src/jit-test/tests/gc/bug-1894442.js
@@ -0,0 +1,6 @@
+// |jit-test| --enable-symbols-as-weakmap-keys; skip-if: helperThreadCount() === 0 || getBuildConfiguration("release_or_beta")
+evalInWorker(`
+  a = new WeakSet
+  a.add(Symbol.hasInstance)
+  gczeal(14)(0 .b)
+`)