guard PER references
diff --git a/skeletons/GeneralizedTime.c b/skeletons/GeneralizedTime.c
index 07297db..61cbf44 100644
--- a/skeletons/GeneralizedTime.c
+++ b/skeletons/GeneralizedTime.c
@@ -181,8 +181,13 @@
GeneralizedTime_encode_der,
OCTET_STRING_decode_xer_utf8,
GeneralizedTime_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_GeneralizedTime_tags,
sizeof(asn_DEF_GeneralizedTime_tags)