diff --git a/include/generic-phy.h b/include/generic-phy.h
index 3d26249..947c582 100644
--- a/include/generic-phy.h
+++ b/include/generic-phy.h
@@ -7,6 +7,7 @@
 #ifndef __GENERIC_PHY_H
 #define __GENERIC_PHY_H
 
+struct ofnode_phandle_args;
 
 /**
  * struct phy - A handle to (allowing control of) a single phy port.