guard PER references
diff --git a/skeletons/RELATIVE-OID.c b/skeletons/RELATIVE-OID.c
index 352ce79..8cc72d3 100644
--- a/skeletons/RELATIVE-OID.c
+++ b/skeletons/RELATIVE-OID.c
@@ -26,8 +26,13 @@
der_encode_primitive,
RELATIVE_OID_decode_xer,
RELATIVE_OID_encode_xer,
+#ifdef ASN_DISABLE_PER_SUPPORT
+ 0,
+ 0,
+#else
OCTET_STRING_decode_uper,
OCTET_STRING_encode_uper,
+#endif /* ASN_DISABLE_PER_SUPPORT */
0, /* Use generic outmost tag fetcher */
asn_DEF_RELATIVE_OID_tags,
sizeof(asn_DEF_RELATIVE_OID_tags)