diff --git a/include/brynet/net/SendableMsg.hpp b/include/brynet/net/SendableMsg.hpp
index 5a265f6..a070856 100644
--- a/include/brynet/net/SendableMsg.hpp
+++ b/include/brynet/net/SendableMsg.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <memory>
 #include <string>