diff --git a/include/wx/dirdlg.h b/include/wx/dirdlg.h
index 32fd5710ec..467786df1b 100644
--- a/include/wx/dirdlg.h
+++ b/include/wx/dirdlg.h
@@ -3,6 +3,8 @@
 
 #if wxUSE_DIRDLG
 
+#include "wx/dialog.h"
+
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------