diff --git a/src/ProjectStatus.h b/src/ProjectStatus.h
index e412ff045..78d1c4a16 100644
--- a/src/ProjectStatus.h
+++ b/src/ProjectStatus.h
@@ -16,6 +16,7 @@ Paul Licameli
 #include <vector>
 #include <wx/event.h> // to declare custom event type
 #include "ClientData.h" // to inherit
+#include "Prefs.h"
 
 class AudacityProject;
 class wxWindow;