diff --git a/src/slic3r/Utils/CalibUtils.cpp b/src/slic3r/Utils/CalibUtils.cpp
index babaa8cd77..2b960b4496 100644
--- a/src/slic3r/Utils/CalibUtils.cpp
+++ b/src/slic3r/Utils/CalibUtils.cpp
@@ -405,8 +405,8 @@ void CalibUtils::calib_flowrate(int pass, const CalibInfo& calib_info, std::stri
         _obj->config.set_key_value("detect_thin_wall", new ConfigOptionBool(true));
         _obj->config.set_key_value("filter_out_gap_fill", new ConfigOptionFloat(0));  // OrcaSlicer parameter
         _obj->config.set_key_value("sparse_infill_pattern", new ConfigOptionEnum<InfillPattern>(ipRectilinear));
-        _obj->config.set_key_value("top_surface_line_width", new ConfigOptionFloat(nozzle_diameter * 1.2f));
-        _obj->config.set_key_value("internal_solid_infill_line_width", new ConfigOptionFloat(nozzle_diameter * 1.2f));
+        _obj->config.set_key_value("top_surface_line_width", new ConfigOptionFloatOrPercent(nozzle_diameter * 1.2f, false));
+        _obj->config.set_key_value("internal_solid_infill_line_width", new ConfigOptionFloatOrPercent(nozzle_diameter * 1.2f, false));
         _obj->config.set_key_value("top_surface_pattern", new ConfigOptionEnum<InfillPattern>(ipMonotonic));
         _obj->config.set_key_value("top_solid_infill_flow_ratio", new ConfigOptionFloat(1.0f));
         _obj->config.set_key_value("infill_direction", new ConfigOptionFloat(45));