diff --git a/oqsprov/oqs_sig.c b/oqsprov/oqs_sig.c
index a46d5e35..edf68b7e 100644
--- a/oqsprov/oqs_sig.c
+++ b/oqsprov/oqs_sig.c
@@ -443,7 +443,6 @@ static int oqs_sig_sign(void *vpoqs_sigctx, unsigned char *sig, size_t *siglen,
             CompositeSignature_free(compsig);
             goto endsign;
         }
-        final_tbslen -= 1;
         final_tbs = OPENSSL_malloc(final_tbslen);
         composite_prefix_conversion(final_tbs, oid_prefix);
         memcpy(final_tbs + COMPOSITE_OID_PREFIX_LEN / 2, tbs_hash,
@@ -773,7 +772,6 @@ static int oqs_sig_verify(void *vpoqs_sigctx, const unsigned char *sig,
             CompositeSignature_free(compsig);
             goto endverify;
         }
-        final_tbslen -= 1;
         final_tbs = OPENSSL_malloc(final_tbslen);
         composite_prefix_conversion(final_tbs, oid_prefix);
         memcpy(final_tbs + COMPOSITE_OID_PREFIX_LEN / 2, tbs_hash,