diff --git a/src/libslic3r/AppConfig.cpp b/src/libslic3r/AppConfig.cpp
index cf023d9da..149ff5d61 100644
--- a/src/libslic3r/AppConfig.cpp
+++ b/src/libslic3r/AppConfig.cpp
@@ -173,7 +173,7 @@ void AppConfig::set_defaults()
      if (get("enable_append_color_by_sync_ams").empty())
         set_bool("enable_append_color_by_sync_ams", false);
     if (get("enable_merge_color_by_sync_ams").empty())
-        set_bool("enable_merge_color_by_sync_ams", false);
+        set_bool("enable_merge_color_by_sync_ams", true);
 
     if (get("zoom_to_mouse").empty())
         set_bool("zoom_to_mouse", false);