diff --git a/src/constr_SEQUENCE_OF.c b/src/constr_SEQUENCE_OF.c
index aa10117..6981c8b 100644
--- a/src/constr_SEQUENCE_OF.c
+++ b/src/constr_SEQUENCE_OF.c
@@ -164,7 +164,7 @@
 	if(ct) {
 		int not_in_root = (list->count < ct->lower_bound
 				|| list->count > ct->upper_bound);
-		ASN_DEBUG("lb %ld ub %ld %s",
+		ASN_DEBUG("lb %lld ub %lld %s",
 			ct->lower_bound, ct->upper_bound,
 			ct->flags & APC_EXTENSIBLE ? "ext" : "fix");
 		if(ct->flags & APC_EXTENSIBLE) {
@@ -206,3 +206,70 @@
 	_ASN_ENCODED_OK(er);
 }
 
+asn_enc_rval_t
+SEQUENCE_OF_encode_aper(asn_TYPE_descriptor_t *td,
+	asn_per_constraints_t *constraints, void *sptr, asn_per_outp_t *po) {
+	asn_anonymous_sequence_ *list;
+	asn_per_constraint_t *ct;
+	asn_enc_rval_t er;
+	asn_TYPE_member_t *elm = td->elements;
+	int seq;
+
+	if(!sptr) _ASN_ENCODE_FAILED;
+	list = _A_SEQUENCE_FROM_VOID(sptr);
+
+	er.encoded = 0;
+
+	ASN_DEBUG("Encoding %s as SEQUENCE OF size (%d) using ALIGNED PER", td->name, list->count);
+
+	if(constraints) ct = &constraints->size;
+	else if(td->per_constraints) ct = &td->per_constraints->size;
+	else ct = 0;
+
+	/* If extensible constraint, check if size is in root */
+	if(ct) {
+		int not_in_root = (list->count < ct->lower_bound
+				|| list->count > ct->upper_bound);
+		ASN_DEBUG("lb %lld ub %lld %s",
+			ct->lower_bound, ct->upper_bound,
+			ct->flags & APC_EXTENSIBLE ? "ext" : "fix");
+		if(ct->flags & APC_EXTENSIBLE) {
+			/* Declare whether size is in extension root */
+			if(per_put_few_bits(po, not_in_root, 1))
+				_ASN_ENCODE_FAILED;
+			if(not_in_root) ct = 0;
+		} else if(not_in_root && ct->effective_bits >= 0)
+			_ASN_ENCODE_FAILED;
+	}
+
+	if(ct && ct->effective_bits >= 0) {
+		/* X.691, #19.5: No length determinant */
+//		 if(per_put_few_bits(po, list->count - ct->lower_bound,
+//				 ct->effective_bits))
+//			 _ASN_ENCODE_FAILED;
+		if (aper_put_length(po, ct->upper_bound - ct->lower_bound + 1, list->count - ct->lower_bound) < 0)
+			_ASN_ENCODE_FAILED;
+	}
+
+	for(seq = -1; seq < list->count;) {
+		ssize_t mayEncode;
+		if(seq < 0) seq = 0;
+		if(ct && ct->effective_bits >= 0) {
+			mayEncode = list->count;
+		} else {
+			mayEncode = aper_put_length(po, -1, list->count - seq);
+			if(mayEncode < 0) _ASN_ENCODE_FAILED;
+		}
+
+		while(mayEncode--) {
+			void *memb_ptr = list->array[seq++];
+			if(!memb_ptr) _ASN_ENCODE_FAILED;
+			er = elm->type->aper_encoder(elm->type,
+				elm->per_constraints, memb_ptr, po);
+			if(er.encoded == -1)
+				_ASN_ENCODE_FAILED;
+		}
+	}
+
+	_ASN_ENCODED_OK(er);
+}