diff --git a/include/wx/generic/private/timer.h b/include/wx/generic/private/timer.h
index 6d96389ce8..6941870e96 100644
--- a/include/wx/generic/private/timer.h
+++ b/include/wx/generic/private/timer.h
@@ -19,7 +19,7 @@
 
 class wxTimerDesc;
 
-class WXDLLIMPEXP_BASE wxGenericTimerImpl : public wxTimerImpl
+class WXDLLIMPEXP_CORE wxGenericTimerImpl : public wxTimerImpl
 {
 public:
     wxGenericTimerImpl(wxTimer* timer) : wxTimerImpl(timer) { Init(); }