diff --git a/libasn1fix/asn1fix_param.h b/libasn1fix/asn1fix_param.h
index 5940b0e..6bf5f42 100644
--- a/libasn1fix/asn1fix_param.h
+++ b/libasn1fix/asn1fix_param.h
@@ -1,6 +1,6 @@
-#ifndef	_ASN1FIX_PARAMETERIZATION_H_
-#define	_ASN1FIX_PARAMETERIZATION_H_
+#ifndef	ASN1FIX_PARAMETERIZATION_H
+#define	ASN1FIX_PARAMETERIZATION_H
 
 asn1p_expr_t *asn1f_parameterization_fork(arg_t *arg, asn1p_expr_t *expr, asn1p_expr_t *rhs_pspecs);
 
-#endif	/* _ASN1FIX_PARAMETERIZATION_H_ */
+#endif	/* ASN1FIX_PARAMETERIZATION_H */