diff --git a/skeletons/BIT_STRING.c b/skeletons/BIT_STRING.c
index 7b8e975..e92f27e 100644
--- a/skeletons/BIT_STRING.c
+++ b/skeletons/BIT_STRING.c
@@ -27,8 +27,13 @@
 	OCTET_STRING_encode_der,   /* Implemented in terms of OCTET STRING */
 	OCTET_STRING_decode_xer_binary,
 	BIT_STRING_encode_xer,
+#ifdef	ASN_DISABLE_PER_SUPPORT
+	0,
+	0,
+#else
 	OCTET_STRING_decode_uper,	/* Unaligned PER decoder */
 	OCTET_STRING_encode_uper,	/* Unaligned PER encoder */
+#endif  /* ASN_DISABLE_PER_SUPPORT */
 	0, /* Use generic outmost tag fetcher */
 	asn_DEF_BIT_STRING_tags,
 	sizeof(asn_DEF_BIT_STRING_tags)