diff --git a/skeletons/NativeInteger_oer.c b/skeletons/NativeInteger_oer.c
index 8cd9fec..58490dd 100644
--- a/skeletons/NativeInteger_oer.c
+++ b/skeletons/NativeInteger_oer.c
@@ -14,7 +14,8 @@
                          asn_TYPE_descriptor_t *td,
                          const asn_oer_constraints_t *constraints,
                          void **nint_ptr, const void *ptr, size_t size) {
-    asn_INTEGER_specifics_t *specs = (asn_INTEGER_specifics_t *)td->specifics;
+    const asn_INTEGER_specifics_t *specs =
+        (const asn_INTEGER_specifics_t *)td->specifics;
     asn_dec_rval_t rval = {RC_OK, 0};
     long *native = (long *)*nint_ptr;
     INTEGER_t tmpint;
@@ -70,7 +71,8 @@
 NativeInteger_encode_oer(asn_TYPE_descriptor_t *td,
                          const asn_oer_constraints_t *constraints, void *sptr,
                          asn_app_consume_bytes_f *cb, void *app_key) {
-    asn_INTEGER_specifics_t *specs = (asn_INTEGER_specifics_t *)td->specifics;
+    const asn_INTEGER_specifics_t *specs =
+        (const asn_INTEGER_specifics_t *)td->specifics;
     INTEGER_t tmpint;
     long native;