diff --git a/source/WorldServer/Web/PeerManager.h b/source/WorldServer/Web/PeerManager.h
index d154fd2..56649be 100644
--- a/source/WorldServer/Web/PeerManager.h
+++ b/source/WorldServer/Web/PeerManager.h
@@ -28,6 +28,7 @@ along with EQ2Emu.  If not, see <http://www.gnu.org/licenses/>.
 #include <optional>
 #include <memory>
 #include <mutex>
+#include <atomic>
 #include <boost/property_tree/ptree.hpp>
 #include <boost/property_tree/json_parser.hpp>
 #include "../../common/types.h"