diff --git a/libasn1print/asn1print.c b/libasn1print/asn1print.c
index 992dcfa..8e8049d 100644
--- a/libasn1print/asn1print.c
+++ b/libasn1print/asn1print.c
@@ -84,6 +84,8 @@
 	int ac;
 	int accum = 0;
 
+	(void)flags;	/* Unused argument */
+
 	printf("{");
 	for(ac = 0; ac < oid->arcs_count; ac++) {
 		if(accum + strlen(oid->arcs[ac].name?:"") > 50) {
@@ -111,6 +113,8 @@
 asn1print_ref(asn1p_ref_t *ref, enum asn1print_flags_e flags) {
 	int cc;
 
+	(void)flags;	/* Unused argument */
+
 	for(cc = 0; cc < ref->comp_count; cc++) {
 		if(cc) printf(".");
 		printf("%s", ref->components[cc].name);
@@ -123,6 +127,8 @@
 asn1print_tag(asn1p_expr_t *tc, enum asn1print_flags_e flags) {
 	struct asn1p_type_tag_s *tag = &tc->tag;
 
+	(void)flags;	/* Unused argument */
+
 	if(tag->tag_class == TC_NOCLASS)
 		return 0;