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)