diff --git a/include/wx/generic/progdlgg.h b/include/wx/generic/progdlgg.h
index cca4526f6c..c8585ed15c 100644
--- a/include/wx/generic/progdlgg.h
+++ b/include/wx/generic/progdlgg.h
@@ -17,6 +17,7 @@
 class WXDLLIMPEXP_FWD_CORE wxButton;
 class WXDLLIMPEXP_FWD_CORE wxGauge;
 class WXDLLIMPEXP_FWD_CORE wxStaticText;
+class WXDLLIMPEXP_FWD_CORE wxWindowDisabler;
 
 /*
     Progress dialog which shows a moving progress bar.
@@ -194,7 +195,7 @@ private:
          m_hasSkipButton;
 
     // for wxPD_APP_MODAL case
-    class WXDLLIMPEXP_FWD_CORE wxWindowDisabler *m_winDisabler;
+    wxWindowDisabler *m_winDisabler;
 
     DECLARE_EVENT_TABLE()
     wxDECLARE_NO_COPY_CLASS(wxGenericProgressDialog);
diff --git a/src/generic/progdlgg.cpp b/src/generic/progdlgg.cpp
index 9cb3d3451f..fbfb8a8e32 100644
--- a/src/generic/progdlgg.cpp
+++ b/src/generic/progdlgg.cpp
@@ -125,6 +125,8 @@ void wxGenericProgressDialog::Init(wxWindow *parent, int maximum, int style)
 
     m_hasAbortButton =
     m_hasSkipButton = false;
+
+    m_winDisabler = NULL;
 }
 
 wxGenericProgressDialog::wxGenericProgressDialog(wxWindow *parent,