Makefile: fixup init.c dependency

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/Makefile b/Makefile
index a2d671d..d097c05 100644
--- a/Makefile
+++ b/Makefile
@@ -180,7 +180,7 @@
 
 override CFLAGS += -DFIO_VERSION='"$(FIO_VERSION)"'
 
-.c.o: FORCE
+.c.o: FORCE FIO-VERSION-FILE
 	$(QUIET_CC)$(CC) -o $@ $(CFLAGS) $(CPPFLAGS) -c $<
 	@$(CC) -MM $(CFLAGS) $(CPPFLAGS) $*.c > $*.d
 	@mv -f $*.d $*.d.tmp
@@ -189,7 +189,7 @@
 		sed -e 's/^ *//' -e 's/$$/:/' >> $*.d
 	@rm -f $*.d.tmp
 
-init.o: FIO-VERSION-FILE
+init.o: FIO-VERSION-FILE init.c
 	$(QUIET_CC)$(CC) -o init.o $(CFLAGS) $(CPPFLAGS) -c init.c
 
 t/stest: $(T_SMALLOC_OBJS)