diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c
index 2961016097ac..d1f285245af8 100644
--- a/fs/nfsd/nfs4idmap.c
+++ b/fs/nfsd/nfs4idmap.c
@@ -83,7 +83,7 @@ ent_init(struct cache_head *cnew, struct cache_head *citm)
 	new->type = itm->type;
 
 	strlcpy(new->name, itm->name, sizeof(new->name));
-	strlcpy(new->authname, itm->authname, sizeof(new->name));
+	strlcpy(new->authname, itm->authname, sizeof(new->authname));
 }
 
 static void