diff --git a/src/ice/ice_agent.h b/src/ice/ice_agent.h
index d8460b6..627a73c 100644
--- a/src/ice/ice_agent.h
+++ b/src/ice/ice_agent.h
@@ -57,9 +57,9 @@ class IceAgent {
   std::string turn_password_ = "";
 
   std::unique_ptr<std::thread> nice_thread_;
-  std::atomic<NiceAgent*> agent_ = nullptr;
-  std::atomic<GMainLoop*> gloop_ = nullptr;
-  std::atomic<bool> nice_inited_ = false;
+  std::atomic<NiceAgent*> agent_{nullptr};
+  std::atomic<GMainLoop*> gloop_{nullptr};
+  std::atomic<bool> nice_inited_{false};
 
   gboolean exit_nice_thread_ = false;
   bool controlling_ = false;
diff --git a/src/pc/peer_connection.h b/src/pc/peer_connection.h
index 3f3bca8..e5ea40a 100644
--- a/src/pc/peer_connection.h
+++ b/src/pc/peer_connection.h
@@ -91,7 +91,7 @@ class PeerConnection {
   std::vector<std::string> user_id_list_;
   SignalStatus signal_status_ = SignalStatus::SignalClosed;
   std::mutex signal_status_mutex_;
-  std::atomic<bool> leave_ = false;
+  std::atomic<bool> leave_{false};
 
  private:
   std::map<std::string, std::unique_ptr<IceTransmission>>
diff --git a/xmake.lua b/xmake.lua
index ab2feba..8df3652 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -3,7 +3,7 @@ set_version("0.0.1")
 set_license("LGPL-3.0")
 
 add_rules("mode.release", "mode.debug")
-set_languages("c++17")
+set_languages("c++14")
 
 set_installdir("$(projectdir)/out")