diff --git a/algo_hs.go b/algo_hs.go
index b5c0cd6..9438fbf 100644
--- a/algo_hs.go
+++ b/algo_hs.go
@@ -38,9 +38,11 @@ func newHS(alg Algorithm, key []byte) (hmacAlgo, error) {
 		alg:  alg,
 		hash: hash,
 		key:  key,
-		hashPool: &sync.Pool{New: func() interface{} {
-			return hmac.New(hash.New, key)
-		}},
+		hashPool: &sync.Pool{
+			New: func() interface{} {
+				return hmac.New(hash.New, key)
+			},
+		},
 	}, nil
 }
 
diff --git a/algo_test.go b/algo_test.go
index db12f4c..21fc01e 100644
--- a/algo_test.go
+++ b/algo_test.go
@@ -26,7 +26,7 @@ func TestSignerAlg(t *testing.T) {
 
 	f(mustSigner(NewSignerES(ES256, ecdsaPrivateKey256)), ES256)
 	f(mustSigner(NewSignerES(ES384, ecdsaPrivateKey384)), ES384)
-	// f(mustSigner(NewSignerES(ES512, ecdsaPrivateKey521)), ES512)
+	f(mustSigner(NewSignerES(ES512, ecdsaPrivateKey521)), ES512)
 }
 
 func TestVerifierAlg(t *testing.T) {
diff --git a/jwt_test.go b/jwt_test.go
index 2343975..fd80d73 100644
--- a/jwt_test.go
+++ b/jwt_test.go
@@ -28,11 +28,6 @@ func mustVerifier(v Verifier, err error) Verifier {
 	return v
 }
 
-type customClaims struct {
-	StandardClaims
-	TestField string `json:"test_field"`
-}
-
 func TestMarshalHeader(t *testing.T) {
 	f := func(h *Header, want string) {
 		t.Helper()