diff --git a/src/Prefs.h b/src/Prefs.h
index f6b8c85d0..70c5c08c9 100644
--- a/src/Prefs.h
+++ b/src/Prefs.h
@@ -33,7 +33,8 @@
 
 #include "../include/audacity/ComponentInterface.h"
 
-#include <wx/config.h> // to inherit wxFileConfig
+#include <wx/config.h>
+#include <wx/fileconf.h>  // to inherit wxFileConfig
 
 void InitPreferences();
 void FinishPreferences();