diff --git a/lib/remote/apilistener-filesync.cpp b/lib/remote/apilistener-filesync.cpp
index 1feb13097..890e3eb5a 100644
--- a/lib/remote/apilistener-filesync.cpp
+++ b/lib/remote/apilistener-filesync.cpp
@@ -20,7 +20,7 @@ using namespace icinga;
 
 REGISTER_APIFUNCTION(Update, config, &ApiListener::ConfigUpdateHandler);
 
-boost::mutex ApiListener::m_ConfigSyncStageLock;
+SpinLock ApiListener::m_ConfigSyncStageLock;
 
 /**
  * Entrypoint for updating all authoritative configs from /etc/zones.d, packages, etc.
@@ -321,7 +321,7 @@ void ApiListener::HandleConfigUpdate(const MessageOrigin::Ptr& origin, const Dic
 	/* Only one transaction is allowed, concurrent message handlers need to wait.
 	 * This affects two parent endpoints sending the config in the same moment.
 	 */
-	auto lock (Shared<boost::mutex::scoped_lock>::Make(m_ConfigSyncStageLock));
+	auto lock (Shared<std::unique_lock<SpinLock>>::Make(m_ConfigSyncStageLock));
 
 	String apiZonesStageDir = GetApiZonesStageDir();
 	String fromEndpointName = origin->FromClient->GetEndpoint()->GetName();
@@ -618,7 +618,7 @@ void ApiListener::TryActivateZonesStageCallback(const ProcessResult& pr,
  *
  * @param relativePaths Required for later file operations in the callback. Provides the zone name plus path in a list.
  */
-void ApiListener::AsyncTryActivateZonesStage(const std::vector<String>& relativePaths, const Shared<boost::mutex::scoped_lock>::Ptr& lock)
+void ApiListener::AsyncTryActivateZonesStage(const std::vector<String>& relativePaths, const Shared<std::unique_lock<SpinLock>>::Ptr& lock)
 {
 	VERIFY(Application::GetArgC() >= 1);
 
diff --git a/lib/remote/apilistener.hpp b/lib/remote/apilistener.hpp
index 4a3623a68..3205fa265 100644
--- a/lib/remote/apilistener.hpp
+++ b/lib/remote/apilistener.hpp
@@ -11,6 +11,7 @@
 #include "base/configobject.hpp"
 #include "base/process.hpp"
 #include "base/shared.hpp"
+#include "base/spinlock.hpp"
 #include "base/timer.hpp"
 #include "base/workqueue.hpp"
 #include "base/tcpsocket.hpp"
@@ -21,6 +22,7 @@
 #include <boost/asio/ip/tcp.hpp>
 #include <boost/asio/spawn.hpp>
 #include <boost/asio/ssl/context.hpp>
+#include <mutex>
 #include <set>
 
 namespace icinga
@@ -186,7 +188,7 @@ private:
 	void RemoveStatusFile();
 
 	/* filesync */
-	static boost::mutex m_ConfigSyncStageLock;
+	static SpinLock m_ConfigSyncStageLock;
 
 	void SyncLocalZoneDirs() const;
 	void SyncLocalZoneDir(const Zone::Ptr& zone) const;
@@ -200,7 +202,7 @@ private:
 
 	static void TryActivateZonesStageCallback(const ProcessResult& pr,
 		const std::vector<String>& relativePaths);
-	static void AsyncTryActivateZonesStage(const std::vector<String>& relativePaths, const Shared<boost::mutex::scoped_lock>::Ptr& lock);
+	static void AsyncTryActivateZonesStage(const std::vector<String>& relativePaths, const Shared<std::unique_lock<SpinLock>>::Ptr& lock);
 
 	static String GetChecksum(const String& content);
 	static bool CheckConfigChange(const ConfigDirInformation& oldConfig, const ConfigDirInformation& newConfig);