diff --git a/lang/Makefile b/lang/Makefile
index dacb1d88727..28e714054f5 100644
--- a/lang/Makefile
+++ b/lang/Makefile
@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.113 2011/06/29 08:28:47 rpointel Exp $
+# $OpenBSD: Makefile,v 1.114 2011/07/02 09:48:48 jasper Exp $
 # $FreeBSD: Makefile,v 1.89 1997/11/24 09:24:06 tg Exp $
 #
 
@@ -11,6 +11,7 @@
      SUBDIR += clisp
      SUBDIR += clojure
      SUBDIR += cython
+     SUBDIR += datalog
      SUBDIR += eagle
      SUBDIR += ecl
      SUBDIR += eltclsh