diff --git a/src/mess/mess.mak b/src/mess/mess.mak
index 7db3acab11a..387cf4430b6 100644
--- a/src/mess/mess.mak
+++ b/src/mess/mess.mak
@@ -464,6 +464,8 @@ $(MESSOBJ)/mame.a: \
 	$(MAME_MACHINE)/megacdcd.o  \
 	$(MAME_MACHINE)/mega32x.o   \
 	$(MAME_MACHINE)/megavdp.o   \
+	$(MAME_MACHINE)/segamsys.o  \
+	$(MAME_DRIVERS)/megatech.o  \
 	$(MAME_MACHINE)/dc.o        \
 	$(MAME_DRIVERS)/naomi.o     \
 	$(MAME_MACHINE)/dc.o        \