diff --git a/src/Makefile b/src/Makefile
index 301912aa0..fe93dd38e 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -20,7 +20,8 @@ include $(TOPDIR)/Rules.make
 
 OBJS=
 
-MODULES= clone map unit action ai ui sound video network pathfinder siod game
+MODULES= clone map unit action ai ui sound video network pathfinder siod \
+	 game beos
 
 all::
 	@set -e; for i in $(MODULES) ; do $(MAKE) -C $$i all ; done