diff --git a/sys/dev/mii/micphy.c b/sys/dev/mii/micphy.c
index fa212bf4365..4783398886f 100644
--- a/sys/dev/mii/micphy.c
+++ b/sys/dev/mii/micphy.c
@@ -276,6 +276,8 @@ micphy_attach(device_t dev)
 	else
 		ksz9021_load_values(sc, cfg->phynode);
 
+	mii_fdt_free_config(cfg);
+
 	return (0);
 }