diff --git a/mip/mip.h b/mip/mip.h
index ae932e9a..94a27291 100644
--- a/mip/mip.h
+++ b/mip/mip.h
@@ -50,6 +50,7 @@ struct mip_if {
 };
 
 void mip_init(struct mg_mgr *, struct mip_if *);
+void mip_free(struct mip_if *);
 
 extern struct mip_driver mip_driver_stm32;
 extern struct mip_driver mip_driver_enc28j60;