diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index 96110db39f..d7b695736b 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -8003,7 +8003,7 @@ void Plater::calib_flowrate(int pass) {
         _obj->ensure_on_bed();
         _obj->config.set_key_value("wall_loops", new ConfigOptionInt(3));
         _obj->config.set_key_value("only_one_wall_top", new ConfigOptionBool(true));
-        _obj->config.set_key_value("sparse_infill_density", new ConfigOptionPercent(55));
+        _obj->config.set_key_value("sparse_infill_density", new ConfigOptionPercent(35));
         _obj->config.set_key_value("bottom_shell_layers", new ConfigOptionInt(1));
         _obj->config.set_key_value("top_shell_layers", new ConfigOptionInt(5));
         _obj->config.set_key_value("detect_thin_wall", new ConfigOptionBool(true));