diff --git a/servers/slapd/overlays/syncprov.c b/servers/slapd/overlays/syncprov.c
index 8406102a19..238062295c 100644
--- a/servers/slapd/overlays/syncprov.c
+++ b/servers/slapd/overlays/syncprov.c
@@ -1489,7 +1489,7 @@ syncprov_op_response( Operation *op, SlapReply *rs )
 		/* Update our context CSN */
 		cbuf[0] = '\0';
 		ldap_pvt_thread_mutex_lock( &si->si_csn_mutex );
-		slap_get_commit_csn( op, &maxcsn, NULL );
+		slap_get_commit_csn( op, &maxcsn );
 		if ( !BER_BVISNULL( &maxcsn ) ) {
 			strcpy( cbuf, maxcsn.bv_val );
 			if ( ber_bvcmp( &maxcsn, &si->si_ctxcsn ) > 0 ) {