diff --git a/drivers/staging/comedi/drivers/ni_mio_cs.c b/drivers/staging/comedi/drivers/ni_mio_cs.c
index 9acaad2c5821..ca4f8e06e75b 100644
--- a/drivers/staging/comedi/drivers/ni_mio_cs.c
+++ b/drivers/staging/comedi/drivers/ni_mio_cs.c
@@ -421,7 +421,7 @@ MODULE_AUTHOR("David A. Schleef <ds@schleef.org>");
 MODULE_DESCRIPTION("Comedi driver for National Instruments DAQCard E series");
 MODULE_LICENSE("GPL");
 
-struct pcmcia_driver ni_mio_cs_driver = {
+static struct pcmcia_driver ni_mio_cs_driver = {
 	.probe = &cs_attach,
 	.remove = &cs_detach,
 	.suspend = &mio_cs_suspend,