diff --git a/src/libslic3r/calib.hpp b/src/libslic3r/calib.hpp
index 02b5c0695f..23d30b21c5 100644
--- a/src/libslic3r/calib.hpp
+++ b/src/libslic3r/calib.hpp
@@ -312,9 +312,9 @@ public:
 
 protected:
     // todo multi_extruders:
-    double speed_first_layer() const { return m_config.get_abs_value_at("initial_layer_speed", m_params.extruder_id); };
-    double speed_perimeter() const { return m_config.get_abs_value_at("outer_wall_speed", m_params.extruder_id); };
-    double accel_perimeter() const { return m_config.get_abs_value_at("outer_wall_acceleration", m_params.extruder_id); }
+    double speed_first_layer() const { return m_config.option<ConfigOptionFloat>("initial_layer_speed")->value; };
+    double speed_perimeter() const { return m_config.option<ConfigOptionFloat>("outer_wall_speed")->value; };
+    double accel_perimeter() const { return m_config.option<ConfigOptionFloat>("outer_wall_acceleration")->value; }
     double line_width_first_layer() const;
     double line_width() const;
     int    wall_count() const { return m_config.option<ConfigOptionInt>("wall_loops")->value; };