diff --git a/src/abaddon.hpp b/src/abaddon.hpp
index c267269..3cd04e9 100644
--- a/src/abaddon.hpp
+++ b/src/abaddon.hpp
@@ -1,3 +1,4 @@
+#pragma once
 #include <gtkmm.h>
 #include <memory>
 #include <mutex>