diff --git a/drivers/pcmcia/cs_internal.h b/drivers/pcmcia/cs_internal.h
index 580369f3c0b0..999332bc4378 100644
--- a/drivers/pcmcia/cs_internal.h
+++ b/drivers/pcmcia/cs_internal.h
@@ -132,7 +132,7 @@ void pcmcia_put_socket(struct pcmcia_socket *skt);
  * Stuff internal to module "pcmcia".
  */
 /* ds.c */
-extern struct bus_type pcmcia_bus_type;
+extern const struct bus_type pcmcia_bus_type;
 
 struct pcmcia_device;
 
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index b4b8363d1de2..d3cfd353fb93 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -1406,7 +1406,7 @@ static const struct dev_pm_ops pcmcia_bus_pm_ops = {
 	SET_SYSTEM_SLEEP_PM_OPS(pcmcia_dev_suspend, pcmcia_dev_resume)
 };
 
-struct bus_type pcmcia_bus_type = {
+const struct bus_type pcmcia_bus_type = {
 	.name = "pcmcia",
 	.uevent = pcmcia_bus_uevent,
 	.match = pcmcia_bus_match,