do not use reserved identifiers
diff --git a/libasn1fix/asn1fix_retrieve.h b/libasn1fix/asn1fix_retrieve.h
index 2aeb82b..5323904 100644
--- a/libasn1fix/asn1fix_retrieve.h
+++ b/libasn1fix/asn1fix_retrieve.h
@@ -1,8 +1,8 @@
/*
* Miscellaneous functions necessary for several other modules.
*/
-#ifndef _ASN1FIX_RETRIEVE_H_
-#define _ASN1FIX_RETRIEVE_H_
+#ifndef ASN1FIX_RETRIEVE_H
+#define ASN1FIX_RETRIEVE_H
/*
* Simple search for the label in the descendants of the given node.
@@ -68,4 +68,4 @@
*/
asn1p_expr_t *asn1f_find_terminal_value(arg_t *arg, asn1p_expr_t *tc);
-#endif /* _ASN1FIX_RETRIEVE_H_ */
+#endif /* ASN1FIX_RETRIEVE_H */