diff --git a/harbour/source/rtl/natmsg/msguk.c b/harbour/source/rtl/natmsg/msguk.c
index 9a78a5607d..85b495aadc 100644
--- a/harbour/source/rtl/natmsg/msguk.c
+++ b/harbour/source/rtl/natmsg/msguk.c
@@ -5,6 +5,8 @@
 /* English language module */
 /* Codepage: N/A           */
 
+#include <hbdefs.h>
+
 char *hb_monthsname[ 12 ] = {
    "January", "February", "March",
    "April", "May", "June", "July",