Ensure header only included once

diff --git a/src/protocols/der/der.h b/src/protocols/der/der.h
index a8703e78849adb693e71fd3d70520822b28664aa..b978d0f04382350003642a5d30f8a4e54f973447 100644 (file)
--- a/src/protocols/der/der.h
+++ b/src/protocols/der/der.h
@@ -1,3 +1,4 @@
+#pragma once
 /*
  *   This library is free software; you can redistribute it and/or
  *   modify it under the terms of the GNU Lesser General Public