diff -r 6ffeffb6d635 -r f3aced6c5f8b targets/beremiz.h
--- a/targets/beremiz.h	Sat Jan 12 13:57:16 2019 +0300
+++ b/targets/beremiz.h	Sat Jan 12 15:02:17 2019 +0300
@@ -1,3 +1,6 @@
+#ifndef _BEREMIZ_H_
+#define _BEREMIZ_H_
+
 /* Beremiz' header file for use by extensions */
 
 #include "iec_types.h"
@@ -24,3 +27,4 @@
 
 long AtomicCompareExchange(long* atomicvar,long compared, long exchange);
 
+#endif