diff --git a/skeletons/constr_SET.h b/skeletons/constr_SET.h
index 0c78ed5..6a3a1aa 100644
--- a/skeletons/constr_SET.h
+++ b/skeletons/constr_SET.h
@@ -12,7 +12,7 @@
 #endif
 
 
-typedef struct asn_SET_specifics_s {
+typedef const struct asn_SET_specifics_s {
 	/*
 	 * Target structure description.
 	 */
@@ -25,21 +25,21 @@
 	 * Sometimes suitable for DER encoding (untagged CHOICE is present);
 	 * if so, tag2el_count will be greater than td->elements_count.
 	 */
-	asn_TYPE_tag2member_t *tag2el;
+	const asn_TYPE_tag2member_t *tag2el;
 	int tag2el_count;
 
 	/*
 	 * Tags to members mapping table, second edition.
 	 * Suitable for CANONICAL-XER encoding.
 	 */
-	asn_TYPE_tag2member_t *tag2el_cxer;
+	const asn_TYPE_tag2member_t *tag2el_cxer;
 	int tag2el_cxer_count;
 
 	/*
 	 * Extensions-related stuff.
 	 */
 	int extensible;				/* Whether SET is extensible */
-	unsigned int *_mandatory_elements;	/* Bitmask of mandatory ones */
+	const unsigned int *_mandatory_elements;	/* Bitmask of mandatory ones */
 } asn_SET_specifics_t;
 
 /*