1 files changed, 2 insertions, 3 deletions
diff --git a/src/MuxElements.h b/src/MuxElements.h
index 73637ac..259d5d9 100644
--- a/src/MuxElements.h
+++ b/src/MuxElements.h
@@ -31,6 +31,7 @@
 
 #include <vector>
 #include <memory>
+#include <mutex>
 #include <string>
 #include <functional>
 #include <exception>
@@ -110,17 +111,15 @@ class AnnouncementCluster : public RemoteControllable {
         bool is_active(void);
 
     private:
+        mutable std::mutex m_active_mutex;
         bool m_active = false;
-
         boost::optional<
             std::chrono::time_point<
                 std::chrono::steady_clock> > m_deferred_start_time;
-
         boost::optional<
             std::chrono::time_point<
                 std::chrono::steady_clock> > m_deferred_stop_time;
 
-
         /* Remote control */
         virtual void set_parameter(const std::string& parameter,
                const std::string& value);