diff --git a/include/net/ncsi.h b/include/net/ncsi.h
index 70d14ee..1dbf42f7 100644
--- a/include/net/ncsi.h
+++ b/include/net/ncsi.h
@@ -30,6 +30,7 @@
 #ifdef CONFIG_NET_NCSI
 struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
 				   void (*notifier)(struct ncsi_dev *nd));
+int ncsi_start_dev(struct ncsi_dev *nd);
 void ncsi_unregister_dev(struct ncsi_dev *nd);
 #else /* !CONFIG_NET_NCSI */
 static inline struct ncsi_dev *ncsi_register_dev(struct net_device *dev,
@@ -38,6 +39,11 @@
 	return NULL;
 }
 
+static inline int ncsi_start_dev(struct ncsi_dev *nd)
+{
+	return -ENOTTY;
+}
+
 static inline void ncsi_unregister_dev(struct ncsi_dev *nd)
 {
 }