diff --git a/include/wx/protocol/file.h b/include/wx/protocol/file.h
index 684df8fd7f..762c1bff9a 100644
--- a/include/wx/protocol/file.h
+++ b/include/wx/protocol/file.h
@@ -23,7 +23,7 @@
 #include "wx/protocol/protocol.h"
 #include "wx/url.h"
 
-class WXDLLEXPORT wxFileProto: public wxProtocol {
+class WXDLLIMPEXP_BASE wxFileProto: public wxProtocol {
   DECLARE_DYNAMIC_CLASS(wxFileProto)
   DECLARE_PROTOCOL(wxFileProto)
 protected: