diff --git a/drivers/net/smsc911x.c b/drivers/net/smsc911x.c
index 4b8ff84..ae32716 100644
--- a/drivers/net/smsc911x.c
+++ b/drivers/net/smsc911x.c
@@ -1526,7 +1526,7 @@
 }
 
 #ifdef CONFIG_NET_POLL_CONTROLLER
-void smsc911x_poll_controller(struct net_device *dev)
+static void smsc911x_poll_controller(struct net_device *dev)
 {
 	disable_irq(dev->irq);
 	smsc911x_irqhandler(0, dev);