diff --git a/include/net/wpan-phy.h b/include/net/wpan-phy.h
index f63537c..a65e985 100644
--- a/include/net/wpan-phy.h
+++ b/include/net/wpan-phy.h
@@ -44,6 +44,8 @@
 	char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
 };
 
+#define to_phy(_dev)	container_of(_dev, struct wpan_phy, dev)
+
 struct wpan_phy *wpan_phy_alloc(size_t priv_size);
 static inline void wpan_phy_set_dev(struct wpan_phy *phy, struct device *dev)
 {