diff --git a/src/slic3r/GUI/MainFrame.cpp b/src/slic3r/GUI/MainFrame.cpp
index 9c98f0f2e..eba169dc9 100644
--- a/src/slic3r/GUI/MainFrame.cpp
+++ b/src/slic3r/GUI/MainFrame.cpp
@@ -389,7 +389,7 @@ void MainFrame::update_layout()
 #if ENABLE_GCODE_VIEWER_AS_STATE
     case ESettingsLayout::GCodeViewer:
     {
-        GetSizer()->Add(m_plater, 1, wxEXPAND);
+        m_main_sizer->Add(m_plater, 1, wxEXPAND);
         m_plater->Show();
         break;
     }