diff --git a/src/generic/aboutdlgg.cpp b/src/generic/aboutdlgg.cpp
index 4340dabce1..60bcdcffda 100644
--- a/src/generic/aboutdlgg.cpp
+++ b/src/generic/aboutdlgg.cpp
@@ -147,7 +147,7 @@ bool wxGenericAboutDialog::Create(const wxAboutDialogInfo& info, wxWindow* paren
         nameAndVersion << wxT(' ') << info.GetVersion();
     wxStaticText *label = new wxStaticText(this, wxID_ANY, nameAndVersion);
     wxFont fontBig(*wxNORMAL_FONT);
-    fontBig.SetPointSize(fontBig.GetPointSize() + 2);
+    fontBig.SetFractionalPointSize(fontBig.GetFractionalPointSize() + 2.0);
     fontBig.SetWeight(wxFONTWEIGHT_BOLD);
     label->SetFont(fontBig);
 
diff --git a/src/propgrid/editors.cpp b/src/propgrid/editors.cpp
index 6d4fcbd8fa..0b8e439faa 100644
--- a/src/propgrid/editors.cpp
+++ b/src/propgrid/editors.cpp
@@ -2056,7 +2056,7 @@ wxWindow* wxPropertyGrid::GenerateEditorButton( const wxPoint& pos, const wxSize
 
   #ifdef __WXGTK__
     wxFont font = GetFont();
-    font.SetPointSize(font.GetPointSize()-2);
+    font.SetFractionalPointSize(font.GetFractionalPointSize()-2);
     but->SetFont(font);
   #else
     but->SetFont(GetFont());