diff --git a/sys/unix/Makefile.utl b/sys/unix/Makefile.utl
index 3a12e0a2f..c51e1991a 100644
--- a/sys/unix/Makefile.utl
+++ b/sys/unix/Makefile.utl
@@ -378,7 +378,7 @@ uudecode.o: ../sys/share/uudecode.c
 # make sure host object files from src are available when needed
 # (note: these dependencies have been copied from Makefile.src so only come
 # indirectly from 'make depend', hence are subject to bit rot as src changes)
-$(OBJDIR)/alloc.o: ../src/alloc.c $(CONFIG_H)
+$(OBJDIR)/alloc.o: ../src/alloc.c $(CONFIG_H) ../include/nhlua.h
 	$(CC) $(CFLAGS) $(CSTD) -c ../src/alloc.c -o $@
 $(OBJDIR)/drawing.o: ../src/drawing.c $(CONFIG_H) ../include/color.h \
 		../include/rm.h ../include/objclass.h ../include/defsym.h \
@@ -400,7 +400,8 @@ $(OBJDIR)/dlb.o: ../src/dlb.c $(CONFIG_H) ../include/dlb.h
 # this differs substantially from what Makefile.src specifies
 $(OBJDIR)/date.o: ../src/date.c $(CONFIG_H)
 	$(CC) $(CFLAGS) $(CSTD) -c ../src/date.c -o $@
-
+../include/nhlua.h:
+	@( cd .. ; $(MAKE) lua_support )
 # make sure hack.h dependencies get transitive information
 $(HACK_H): $(CONFIG_H)
 	@( cd ../src ; $(MAKE) $(HACK_H) )