set merge_stages(3) {}
        set merge_stages_buf {}
 
-       set merge_stages_fd [eval git_read ls-files -u -z -- $path]
+       set merge_stages_fd [eval git_read ls-files -u -z -- {$path}]
 
        fconfigure $merge_stages_fd -blocking 0 -translation binary -encoding binary
        fileevent $merge_stages_fd readable [list read_merge_stages $merge_stages_fd $cont]
                delete_temp_files $mtool_tmpfiles
                ui_status [mc "Merge tool failed."]
        } else {
-               if {[is_config_true merge.keepbackup]} {
+               if {[is_config_true mergetool.keepbackup]} {
                        file rename -force -- $backup "$mtool_target.orig"
                }