diff --git a/src/kex.c b/src/kex.c
index ea9307d0..1a8f70b8 100644
--- a/src/kex.c
+++ b/src/kex.c
@@ -1590,8 +1590,8 @@ kex_method_diffie_hellman_group_exchange_sha256_key_exchange(
     int rc;
 
     if(key_state->state == libssh2_NB_state_idle) {
-        key_state->p = _libssh2_bn_init();
-        key_state->g = _libssh2_bn_init();
+        key_state->p = _libssh2_bn_init_from_bin();
+        key_state->g = _libssh2_bn_init_from_bin();
         /* Ask for a P and G pair */
         key_state->request[0] = SSH_MSG_KEX_DH_GEX_REQUEST;
         _libssh2_htonu32(key_state->request + 1, LIBSSH2_DH_GEX_MINGROUP);