diff --git a/include/wx/debug.h b/include/wx/debug.h
index 80099fa474..46c676359b 100644
--- a/include/wx/debug.h
+++ b/include/wx/debug.h
@@ -19,6 +19,7 @@
 
 #include "wx/chartype.h"     // for __TFILE__ and wxChar
 #include "wx/cpp.h"          // for __WXFUNCTION__
+#include "wx/dlimpexp.h"     // for WXDLLIMPEXP_FWD_BASE
 
 class WXDLLIMPEXP_FWD_BASE wxString;
 class WXDLLIMPEXP_FWD_BASE wxCStrData;