guard PER references
diff --git a/skeletons/UTCTime.c b/skeletons/UTCTime.c
index 3983d76..5f4a58a 100644
--- a/skeletons/UTCTime.c
+++ b/skeletons/UTCTime.c
@@ -38,8 +38,13 @@
 	OCTET_STRING_encode_der,    /* Implemented in terms of OCTET STRING */
 	OCTET_STRING_decode_xer_utf8,
 	UTCTime_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_UTCTime_tags,
 	sizeof(asn_DEF_UTCTime_tags)