diff --git a/include/wx/dc.h b/include/wx/dc.h
index 2f539b4c01..a048ff75c4 100644
--- a/include/wx/dc.h
+++ b/include/wx/dc.h
@@ -40,6 +40,7 @@ class WXDLLIMPEXP_FWD_CORE wxScreenDC;
 class WXDLLIMPEXP_FWD_CORE wxMemoryDC;
 class WXDLLIMPEXP_FWD_CORE wxPrinterDC;
 class WXDLLIMPEXP_FWD_CORE wxPrintData;
+class WXDLLIMPEXP_FWD_CORE wxWindow;
 
 #if wxUSE_GRAPHICS_CONTEXT
 class WXDLLIMPEXP_FWD_CORE wxGraphicsContext;