diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 2abc0e117f11f44450fb924e309bb4e1b868de17..5d5e11b653eba7e3e301c4097c33834e39a55bb7 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1774,7 +1774,7 @@ static inline unsigned int xfrm_alg_len(const struct xfrm_algo *alg)
 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
 }
 
-static inline int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
+static inline unsigned int xfrm_alg_auth_len(const struct xfrm_algo_auth *alg)
 {
 	return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
 }
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 09512d90e6a547bee0cfbe9a5f2433d01e8752d7..465c23d4ea78ec54c79b50543f69bdf1e106c109 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -68,7 +68,7 @@ static int verify_auth_trunc(struct nlattr **attrs)
 		return 0;
 
 	algp = nla_data(rt);
-	if (nla_len(rt) < xfrm_alg_auth_len(algp))
+	if (nla_len(rt) < (int)xfrm_alg_auth_len(algp))
 		return -EINVAL;
 
 	algp->alg_name[sizeof(algp->alg_name) - 1] = '\0';