diff --git a/src/slic3r/GUI/DoubleSlider.cpp b/src/slic3r/GUI/DoubleSlider.cpp
index 617368081..5c16e11ee 100644
--- a/src/slic3r/GUI/DoubleSlider.cpp
+++ b/src/slic3r/GUI/DoubleSlider.cpp
@@ -869,9 +869,12 @@ void Control::draw_cog_icon(wxDC& dc)
     m_rect_cog_icon = wxRect(x_draw, y_draw, m_cog_icon_dim, m_cog_icon_dim);
 }
 
-void Control::update_thumb_rect(const wxCoord& begin_x, const wxCoord& begin_y, const SelectedSlider& selection)
+void Control::update_thumb_rect(const wxCoord begin_x, const wxCoord begin_y, const SelectedSlider& selection)
 {
-    const wxRect& rect = wxRect(begin_x, begin_y + (selection == ssLower ? int(m_thumb_size.y * 0.5) : 0), m_thumb_size.x, int(m_thumb_size.y*0.5));
+    const wxRect rect = is_horizontal() ?
+        wxRect(begin_x + (selection == ssHigher ? m_thumb_size.x / 2 : 0), begin_y, m_thumb_size.x / 2, m_thumb_size.y) :
+        wxRect(begin_x, begin_y + (selection == ssLower ? m_thumb_size.y / 2 : 0), m_thumb_size.x, m_thumb_size.y / 2);
+
     if (selection == ssLower)
         m_rect_lower_thumb = rect;
     else
diff --git a/src/slic3r/GUI/DoubleSlider.hpp b/src/slic3r/GUI/DoubleSlider.hpp
index 71949f7f3..7fbcf607e 100644
--- a/src/slic3r/GUI/DoubleSlider.hpp
+++ b/src/slic3r/GUI/DoubleSlider.hpp
@@ -283,7 +283,7 @@ protected:
     void    draw_tick_text(wxDC& dc, const wxPoint& pos, int tick, bool right_side = true) const;
     void    draw_thumb_text(wxDC& dc, const wxPoint& pos, const SelectedSlider& selection) const;
 
-    void    update_thumb_rect(const wxCoord& begin_x, const wxCoord& begin_y, const SelectedSlider& selection);
+    void    update_thumb_rect(const wxCoord begin_x, const wxCoord begin_y, const SelectedSlider& selection);
     bool    detect_selected_slider(const wxPoint& pt);
     void    correct_lower_value();
     void    correct_higher_value();