diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index e77d5e7d5f64..f8fa20522660 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -150,7 +150,7 @@ static ssize_t portio_size_show(struct uio_port *port, char *buf)
 
 static ssize_t portio_porttype_show(struct uio_port *port, char *buf)
 {
-	const char *porttypes[] = {"none", "x86", "gpio", "other"};
+	static const char * const porttypes[] = {"none", "x86", "gpio", "other"};
 
 	if ((port->porttype < 0) || (port->porttype > UIO_PORT_OTHER))
 		return -EINVAL;