do not use reserved identifiers
diff --git a/libasn1fix/asn1fix_cws.h b/libasn1fix/asn1fix_cws.h
index aa76b49..3d24f16 100644
--- a/libasn1fix/asn1fix_cws.h
+++ b/libasn1fix/asn1fix_cws.h
@@ -1,9 +1,9 @@
-#ifndef _ASN1FIX_CLASS_WITH_SYNTAX_H_
-#define _ASN1FIX_CLASS_WITH_SYNTAX_H_
+#ifndef ASN1FIX_CLASS_WITH_SYNTAX_H
+#define ASN1FIX_CLASS_WITH_SYNTAX_H
/*
* Parse class objects
*/
int asn1f_parse_class_object(arg_t *arg);
-#endif /* _ASN1FIX_CLASS_WITH_SYNTAX_H_ */
+#endif /* ASN1FIX_CLASS_WITH_SYNTAX_H */