diff --git a/crypto/engine/hw_ubsec.c b/crypto/engine/hw_ubsec.c
index e649e6391..e273839b0 100644
--- a/crypto/engine/hw_ubsec.c
+++ b/crypto/engine/hw_ubsec.c
@@ -513,7 +513,6 @@ static int ubsec_mod_exp(BIGNUM *r, BIGNUM *a, const BIGNUM *p,
 		ENGINEerr(ENGINE_F_UBSEC_MOD_EXP, ENGINE_R_BN_EXPAND_FAIL);
 		goto err;
 		}
-	memset(r->d, 0, BN_num_bytes(m));
 
 	if ((fd = p_UBSEC_ubsec_open(UBSEC_KEY_DEVICE_NAME)) <= 0) 
 	        {