diff --git a/src/prefs/ExtImportPrefs.cpp b/src/prefs/ExtImportPrefs.cpp
index 66e7d3186..d740e95e7 100644
--- a/src/prefs/ExtImportPrefs.cpp
+++ b/src/prefs/ExtImportPrefs.cpp
@@ -16,6 +16,7 @@
 
 #include <wx/defs.h>
 #include <wx/listctrl.h>
+#include <wx/msgdlg.h>
 
 #include "ExtImportPrefs.h"
 #include "../Audacity.h"