diff --git a/Makefile b/Makefile
index 7d315af..f51a126 100644
--- a/Makefile
+++ b/Makefile
@@ -30,7 +30,7 @@ deps.mk: *.c drivers/*.c
 %.o: %.c
 	$(CC) $(CPPFLAGS) $(CFLAGS) -c -o $@ $^
 
-%.elf: %.o
+%.elf: %.o $(DRIVER_OBJ:.c=.o)
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^
 	$(SIZE) $@