diff --git a/skeletons/OCTET_STRING_aper.c b/skeletons/OCTET_STRING_aper.c
index 377f71a22..c19131512 100644
--- a/skeletons/OCTET_STRING_aper.c
+++ b/skeletons/OCTET_STRING_aper.c
@@ -60,6 +60,7 @@ OCTET_STRING_decode_aper(const asn_codec_ctx_t *opt_codec_ctx,
 
     switch(specs->subvariant) {
     case ASN_OSUBV_ANY:
+    case ASN_OSUBV_STR:
         canonical_unit_bits = unit_bits = 8;
         if(cval->flags & APC_CONSTRAINED) {
             /* follow power of 2 rule */