diff --git a/include/wx/sizer.h b/include/wx/sizer.h
index 7af1eccb16..0390c59605 100644
--- a/include/wx/sizer.h
+++ b/include/wx/sizer.h
@@ -969,6 +969,10 @@ private:
 
 #endif // wxUSE_STATBOX
 
+//---------------------------------------------------------------------------
+// wxStdDialogButtonSizer
+//---------------------------------------------------------------------------
+
 #if wxUSE_BUTTON
 
 class WXDLLIMPEXP_CORE wxStdDialogButtonSizer: public wxBoxSizer
diff --git a/src/common/sizer.cpp b/src/common/sizer.cpp
index 6e4fbcb376..98e184efdb 100644
--- a/src/common/sizer.cpp
+++ b/src/common/sizer.cpp
@@ -2212,6 +2212,10 @@ bool wxStaticBoxSizer::Detach( wxWindow *window )
 
 #endif // wxUSE_STATBOX
 
+//---------------------------------------------------------------------------
+// wxStdDialogButtonSizer
+//---------------------------------------------------------------------------
+
 #if wxUSE_BUTTON
 
 wxStdDialogButtonSizer::wxStdDialogButtonSizer()