diff --git a/CHANGELOG.md b/CHANGELOG.md
index 15931110339..c7162036553 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@
 * Asynchronous writes did not work with queue-confined Realms (since v11.8.0).
 * Releasing all references to a Realm while an asynchronous write was in progress would sometimes result in use-after-frees (since v11.8.0).
 * Throwing exceptions from asynchronous write callbacks would result in crashes or the Realm being in an invalid state (since v11.8.0).
+* Fix an error when compiling a watchOS Simulator target not supporting Thread-local storage ([#7623](https://github.com/realm/realm-swift/issues/7623), since v11.7.0)
  
 ### Breaking changes
 * Renamed SubscriptionSet::State::Superceded -> Superseded to correct typo.
diff --git a/src/realm/impl/simulated_failure.cpp b/src/realm/impl/simulated_failure.cpp
index a15a3704f07..4cac2e90323 100644
--- a/src/realm/impl/simulated_failure.cpp
+++ b/src/realm/impl/simulated_failure.cpp
@@ -168,7 +168,7 @@ bool SimulatedFailure::do_check_trigger(FailureType failure_type) noexcept
     return false;
 }
 
-#if REALM_ARCHITECTURE_X86_32 && REALM_IOS
+#if (REALM_ARCHITECTURE_X86_32 && REALM_IOS) || (REALM_ARCHITECTURE_X86_64 && REALM_WATCHOS)
 bool (*s_mmap_predicate)(size_t);
 #else
 thread_local bool (*s_mmap_predicate)(size_t);