diff --git a/include/dynarmic/A64/exclusive_monitor.h b/include/dynarmic/A64/exclusive_monitor.h
index 0e0c3b11..6e2d167b 100644
--- a/include/dynarmic/A64/exclusive_monitor.h
+++ b/include/dynarmic/A64/exclusive_monitor.h
@@ -46,6 +46,8 @@ public:
 
     /// Unmark everything.
     void Clear();
+    /// Unmark processor id
+    void Clear(size_t processor_id);
 
 private:
     bool CheckAndClear(size_t processor_id, VAddr address, size_t size);
@@ -53,7 +55,7 @@ private:
     void Lock();
     void Unlock();
 
-    static constexpr VAddr RESERVATION_GRANULE_MASK = 0xFFFF'FFFF'FFFF'FFF0ull;
+    static constexpr VAddr RESERVATION_GRANULE_MASK = 0xFFFF'FFFF'FFFF'FFFFull;
     static constexpr VAddr INVALID_EXCLUSIVE_ADDRESS = 0xDEAD'DEAD'DEAD'DEADull;
     std::atomic_flag is_locked;
     std::vector<VAddr> exclusive_addresses;
diff --git a/src/backend/x64/a64_exclusive_monitor.cpp b/src/backend/x64/a64_exclusive_monitor.cpp
index bd0582a0..0744c4e1 100644
--- a/src/backend/x64/a64_exclusive_monitor.cpp
+++ b/src/backend/x64/a64_exclusive_monitor.cpp
@@ -60,5 +60,12 @@ void ExclusiveMonitor::Clear() {
     Unlock();
 }
 
+void ExclusiveMonitor::Clear(size_t processor_id) {
+    Lock();
+    exclusive_addresses[processor_id] = INVALID_EXCLUSIVE_ADDRESS;
+    Unlock();
+}
+
+
 } // namespace A64
 } // namespace Dynarmic