diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index 0e3378e9a..8ab17717c 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -22,6 +22,8 @@
 #include <GL/glew.h>
 #include <boost/log/trivial.hpp>
 #include <boost/nowide/cstdio.hpp>
+#include <wx/progdlg.h>
+#include <wx/numformatter.h>
 
 #include <array>
 #include <algorithm>
diff --git a/src/slic3r/GUI/GUI_Utils.hpp b/src/slic3r/GUI/GUI_Utils.hpp
index a68a0a88a..ad6bca720 100644
--- a/src/slic3r/GUI/GUI_Utils.hpp
+++ b/src/slic3r/GUI/GUI_Utils.hpp
@@ -116,7 +116,7 @@ public:
         this->Bind(EVT_DPI_CHANGED_SLICER, [this](const DpiChangedEvent& evt) {
             m_scale_factor = (float)evt.dpi / (float)DPI_DEFAULT;
 
-            m_new_font_point_size = get_default_font_for_dpi(evt.dpi).GetPointSize();
+            m_new_font_point_size = get_default_font_for_dpi(this, evt.dpi).GetPointSize();
 
             if (!m_can_rescale)
                 return;