diff --git a/src/include/ipxe/vlan.h b/src/include/ipxe/vlan.h
index c9a9821a..d9f4484e 100644
--- a/src/include/ipxe/vlan.h
+++ b/src/include/ipxe/vlan.h
@@ -59,6 +59,8 @@ struct vlan_header {
  */
 #define VLAN_PRIORITY_IS_VALID( priority ) ( (priority) <= 7 )
 
+extern struct net_device * vlan_find ( struct net_device *trunk,
+				       unsigned int tag );
 extern int vlan_can_be_trunk ( struct net_device *trunk );
 extern int vlan_create ( struct net_device *trunk, unsigned int tag,
 			 unsigned int priority );
diff --git a/src/net/vlan.c b/src/net/vlan.c
index 4440fd84..9ac560f1 100644
--- a/src/net/vlan.c
+++ b/src/net/vlan.c
@@ -193,8 +193,7 @@ static void vlan_sync ( struct net_device *netdev ) {
  * @v tag		VLAN tag
  * @ret netdev		VLAN device, if any
  */
-static struct net_device * vlan_find ( struct net_device *trunk,
-				       uint16_t tag ) {
+struct net_device * vlan_find ( struct net_device *trunk, unsigned int tag ) {
 	struct net_device *netdev;
 	struct vlan_device *vlan;