diff --git a/include/wx/valnum.h b/include/wx/valnum.h
index 0d7892085f..166206138d 100644
--- a/include/wx/valnum.h
+++ b/include/wx/valnum.h
@@ -15,6 +15,7 @@
 
 #if wxUSE_VALIDATORS
 
+#include "wx/textentry.h"
 #include "wx/validate.h"
 
 #include <limits>