add const
diff --git a/libasn1parser/asn1p_ref.h b/libasn1parser/asn1p_ref.h
index 0f1cfe6..c4d8b5c 100644
--- a/libasn1parser/asn1p_ref.h
+++ b/libasn1parser/asn1p_ref.h
@@ -58,6 +58,6 @@
  * -1/ENOMEM:	Memory allocation failed
  */
 int asn1p_ref_add_component(asn1p_ref_t *,
-	char *name, enum asn1p_ref_lex_type_e);
+	const char *name, enum asn1p_ref_lex_type_e);
 
 #endif	/* ASN1_PARSER_REFERENCE_H */