diff --git a/include/wx/checklst.h b/include/wx/checklst.h
index 3d38f28810..a96c2ae3da 100644
--- a/include/wx/checklst.h
+++ b/include/wx/checklst.h
@@ -12,6 +12,8 @@
 #ifndef _WX_CHECKLST_H_BASE_
 #define _WX_CHECKLST_H_BASE_
 
+#include "wx/defs.h"
+
 #if wxUSE_CHECKLISTBOX
 
 #include "wx/listbox.h"