diff --git a/hsm_utils/mybignum.c b/hsm_utils/mybignum.c
index a3d799b..1c1dcc2 100644
--- a/hsm_utils/mybignum.c
+++ b/hsm_utils/mybignum.c
@@ -118,12 +118,12 @@ int my_bignumformatupcall(struct NFast_Application *app,
   return Status_OK;
 }
 
-NFast_BignumUpcalls sbn_upcalls = {
-  sbn_bignumreceiveupcall,
-  sbn_bignumsendlenupcall,
-  sbn_bignumsendupcall,
-  sbn_bignumfreeupcall,
-  sbn_bignumformatupcall
+NFast_BignumUpcalls my_upcalls = {
+  my_bignumreceiveupcall,
+  my_bignumsendlenupcall,
+  my_bignumsendupcall,
+  my_bignumfreeupcall,
+  my_bignumformatupcall
 };
 
 /* --------------------- */
@@ -286,7 +286,7 @@ void my_printbignum ( FILE *f, const char *prefix, const struct NFast_Bignum *pB
   char buf[MAXBIGNUMBITS/4+1];
   int rc;
 
-  rc=sbn_bignum2char(buf, sizeof(buf), pBN, NULL, NULL, NULL);
+  rc = my_bignum2char(buf, sizeof(buf), pBN, NULL, NULL, NULL);
   if ( rc != Status_OK ) strcpy(buf, "<invalid length>");
   fprintf( f, "%s=\n %s\n", prefix, buf );
 }