--- Munin/Master/Update.pm
+++ Munin-ds/Master/Update.pm
@@ -265,7 +265,7 @@
 sub _write_new_service_configs_locked {
     my ($self) = @_;
 
-    my $lock_file = "$config->{rundir}/munin-datafile.lock";
+    my $lock_file = "$config->{dbdir}/datafile.lock";
     munin_runlock($lock_file);
 
     my $config_dump_file = $self->{config_dump_file};