diff --git a/ubitx.h b/ubitx.h
index 2c5ad65..94e911b 100644
--- a/ubitx.h
+++ b/ubitx.h
@@ -1,3 +1,5 @@
+#pragma once
+
 #include "settings.h"
 
 /* The ubitx is powered by an arduino nano. The pin assignment is as folows