diff --git a/src/slic3r/GUI/DeviceManager.cpp b/src/slic3r/GUI/DeviceManager.cpp
index 6062a6534..bbdcff755 100644
--- a/src/slic3r/GUI/DeviceManager.cpp
+++ b/src/slic3r/GUI/DeviceManager.cpp
@@ -2056,7 +2056,8 @@ int MachineObject::command_set_pa_calibration(const std::vector<PACalibResult>&
             j["print"]["filaments"][i]["setting_id"]  = pa_calib_values[i].setting_id;
             j["print"]["filaments"][i]["name"]        = pa_calib_values[i].name;
             j["print"]["filaments"][i]["k_value"]     = std::to_string(pa_calib_values[i].k_value);
-            j["print"]["filaments"][i]["n_coef"]      = std::to_string(pa_calib_values[i].n_coef);
+            // j["print"]["filaments"][i]["n_coef"]      = std::to_string(pa_calib_values[i].n_coef);
+            j["print"]["filaments"][i]["n_coef"] = "0.0";
         }
 
         BOOST_LOG_TRIVIAL(trace) << "extrusion_cali_set: " << j.dump();