diff --git a/src/libslic3r/calib.cpp b/src/libslic3r/calib.cpp
index 4a2014ae69..feee844ec9 100644
--- a/src/libslic3r/calib.cpp
+++ b/src/libslic3r/calib.cpp
@@ -343,7 +343,7 @@ void CalibPressureAdvanceLine::delta_modify_start(double& startx, double& starty
 
 CalibPressureAdvancePattern::CalibPressureAdvancePattern(
     const Calib_Params& params,
-    DynamicPrintConfig& config,
+    DynamicPrintConfig config,
     const bool& is_bbl_machine,
     Model& model
 ) :
diff --git a/src/libslic3r/calib.hpp b/src/libslic3r/calib.hpp
index ce02872e87..2ef39910eb 100644
--- a/src/libslic3r/calib.hpp
+++ b/src/libslic3r/calib.hpp
@@ -140,7 +140,7 @@ friend struct DrawBoxOptArgs;
 public:
     CalibPressureAdvancePattern(
         const Calib_Params& params,
-        DynamicPrintConfig& config,
+        DynamicPrintConfig config,
         const bool& is_bbl_machine,
         Model& model
     );
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index b6d376e34b..f5c43df957 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -8160,7 +8160,7 @@ void Plater::_calib_pa_pattern(const Calib_Params& params)
     wxGetApp().get_tab(Preset::TYPE_PRINT)->update_dirty();
     wxGetApp().get_tab(Preset::TYPE_PRINT)->reload_config();
 
-    DynamicPrintConfig full_config = wxGetApp().preset_bundle->full_config();
+    const DynamicPrintConfig full_config = wxGetApp().preset_bundle->full_config();
     PresetBundle* preset_bundle = wxGetApp().preset_bundle;
     CalibPressureAdvancePattern pa_pattern(
         params,