diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index b7ef2190..0aab3006 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -378,7 +378,8 @@ __PACKAGE__->register_method({
 			$conf->{bootdisk} = $firstdisk;
 		    }
 
-		    PVE::QemuServer::update_conf_nolock($vmid, $conf);
+		    PVE::QemuServer::update_config_nolock($vmid, $conf);
+
 		};
 		my $err = $@;