diff --git a/Contrib/ExDLL/exdll.c b/Contrib/ExDLL/exdll.c
index 7c2ea1c3..7ae6e29e 100644
--- a/Contrib/ExDLL/exdll.c
+++ b/Contrib/ExDLL/exdll.c
@@ -34,6 +34,7 @@ INST_CMDLINE,   // $CMDLINE
 INST_INSTDIR,   // $INSTDIR
 INST_OUTDIR,    // $OUTDIR
 INST_EXEDIR,    // $EXEDIR
+INST_LANG,      // $LANGUAGE
 __INST_LAST
 };