diff --git a/include/wx/mac/carbon/private.h b/include/wx/mac/carbon/private.h
index b4c54a7418..9ba1547d01 100644
--- a/include/wx/mac/carbon/private.h
+++ b/include/wx/mac/carbon/private.h
@@ -381,6 +381,7 @@ private:
 
 wxUint32 wxMacGetSystemEncFromFontEnc(wxFontEncoding encoding) ;
 wxFontEncoding wxMacGetFontEncFromSystemEnc(wxUint32 encoding) ;
+void wxMacWakeUp() ;
 
 // toplevel.cpp