diff --git a/gtk2_ardour/ui_config_vars.h b/gtk2_ardour/ui_config_vars.h
index adb914248f..0789a1a7d0 100644
--- a/gtk2_ardour/ui_config_vars.h
+++ b/gtk2_ardour/ui_config_vars.h
@@ -47,7 +47,11 @@ UI_CONFIG_VARIABLE (bool, new_automation_points_on_lane, "new-automation-points-
 UI_CONFIG_VARIABLE (std::string, keyboard_layout, "keyboard-layout", "ansi")
 UI_CONFIG_VARIABLE (std::string, keyboard_layout_name, "keyboard-layout-name", "ansi")
 UI_CONFIG_VARIABLE (std::string, default_bindings, "default-bindings", "ardour")
+#ifdef MIXBUS
+UI_CONFIG_VARIABLE (bool, only_copy_imported_files, "only-copy-imported-files", true)
+#else
 UI_CONFIG_VARIABLE (bool, only_copy_imported_files, "only-copy-imported-files", false)
+#endif
 UI_CONFIG_VARIABLE (bool, autoplay_files, "autoplay-files", false)
 UI_CONFIG_VARIABLE (bool, default_narrow_ms, "default-narrow_ms", false)
 UI_CONFIG_VARIABLE (bool, name_new_markers, "name-new-markers", false)