diff --git a/skeletons/NativeEnumerated.c b/skeletons/NativeEnumerated.c
index 4ed8749d0..62c1311e8 100644
--- a/skeletons/NativeEnumerated.c
+++ b/skeletons/NativeEnumerated.c
@@ -85,6 +85,8 @@ NativeEnumerated_encode_xer(const asn_TYPE_descriptor_t *td, const void *sptr,
     }
 }
 
+#ifdef	ASN_DISABLE_OER_SUPPORT
+
 asn_dec_rval_t
 NativeEnumerated_decode_uper(const asn_codec_ctx_t *opt_codec_ctx,
                              const asn_TYPE_descriptor_t *td,
@@ -224,3 +226,5 @@ NativeEnumerated_encode_uper(const asn_TYPE_descriptor_t *td,
 	ASN__ENCODED_OK(er);
 }
 
+#endif
+
diff --git a/skeletons/constr_CHOICE.c b/skeletons/constr_CHOICE.c
index 628979ec2..37afb71c4 100644
--- a/skeletons/constr_CHOICE.c
+++ b/skeletons/constr_CHOICE.c
@@ -829,6 +829,8 @@ CHOICE_encode_xer(const asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
 	ASN__ENCODE_FAILED;
 }
 
+#ifndef ASN_DISABLE_PER_SUPPORT
+
 asn_dec_rval_t
 CHOICE_decode_uper(const asn_codec_ctx_t *opt_codec_ctx,
                    const asn_TYPE_descriptor_t *td,
@@ -1010,6 +1012,8 @@ CHOICE_encode_uper(const asn_TYPE_descriptor_t *td,
     }
 }
 
+#endif /* ASN_DISABLE_PER_SUPPORT */
+
 
 int
 CHOICE_print(const asn_TYPE_descriptor_t *td, const void *sptr, int ilevel,
diff --git a/skeletons/constr_SET_OF.c b/skeletons/constr_SET_OF.c
index 02fc51562..a2186b968 100644
--- a/skeletons/constr_SET_OF.c
+++ b/skeletons/constr_SET_OF.c
@@ -383,6 +383,7 @@ SET_OF__encode_sorted(const asn_TYPE_member_t *elm,
             erval = elm->type->op->der_encoder(elm->type, memb_ptr, 0, elm->tag,
                                                _el_addbytes, encoding_el);
             break;
+#ifndef ASN_DISABLE_PER_SUPPORT
         case SOES_CUPER:
             erval = uper_encode(elm->type,
                                 elm->encoding_constraints.per_constraints,
@@ -393,6 +394,7 @@ SET_OF__encode_sorted(const asn_TYPE_member_t *elm,
                 encoding_el->bits_unused = (8 - extra_bits) & 0x7;
             }
             break;
+#endif
         default:
             assert(!"Unreachable");
             break;