diff --git a/include/ipmid/sessionhelper.hpp b/include/ipmid/sessionhelper.hpp
index a96f037..3a72d19 100644
--- a/include/ipmid/sessionhelper.hpp
+++ b/include/ipmid/sessionhelper.hpp
@@ -1,3 +1,5 @@
+#pragma once
+
 #include <sstream>
 #include <string>