diff --git a/src/slic3r/GUI/OG_CustomCtrl.cpp b/src/slic3r/GUI/OG_CustomCtrl.cpp
index 521f5b5592..c7ca05a904 100644
--- a/src/slic3r/GUI/OG_CustomCtrl.cpp
+++ b/src/slic3r/GUI/OG_CustomCtrl.cpp
@@ -826,7 +826,7 @@ void OG_CustomCtrl::CtrlLine::render(wxDC& dc, wxCoord h_pos, wxCoord v_pos)
             draw_buttons(field);
         // update width for full_width fields
         if (option_set.front().opt.full_width && field && field->getWindow())
-            field->getWindow()->SetSize(ctrl->GetSize().x - h_pos2 + h_pos3 - h_pos, -1);
+            field->getWindow()->SetSize(ctrl->GetSize().x - h_pos2 + h_pos3 - h_pos - ctrl->m_em_unit * 3, -1);
         return;
     }