diff --git a/cas/cloudcas/cloudcas.go b/cas/cloudcas/cloudcas.go
index 4866a797..8820304a 100644
--- a/cas/cloudcas/cloudcas.go
+++ b/cas/cloudcas/cloudcas.go
@@ -70,7 +70,7 @@ var newCertificateAuthorityClient = func(ctx context.Context, credentialsFile st
 // New creates a new CertificateAuthorityService implementation using Google
 // Cloud CAS.
 func New(ctx context.Context, opts apiv1.Options) (*CloudCAS, error) {
-	if opts.Certificateauthority == "" {
+	if opts.CertificateAuthority == "" {
 		return nil, errors.New("cloudCAS 'certificateAuthority' cannot be empty")
 	}
 
@@ -81,7 +81,7 @@ func New(ctx context.Context, opts apiv1.Options) (*CloudCAS, error) {
 
 	return &CloudCAS{
 		client:               client,
-		certificateAuthority: opts.Certificateauthority,
+		certificateAuthority: opts.CertificateAuthority,
 	}, nil
 }
 
diff --git a/cas/cloudcas/cloudcas_test.go b/cas/cloudcas/cloudcas_test.go
index f2b708f5..38446325 100644
--- a/cas/cloudcas/cloudcas_test.go
+++ b/cas/cloudcas/cloudcas_test.go
@@ -174,20 +174,20 @@ func TestNew(t *testing.T) {
 		wantErr bool
 	}{
 		{"ok", args{context.Background(), apiv1.Options{
-			Certificateauthority: testAuthorityName,
+			CertificateAuthority: testAuthorityName,
 		}}, &CloudCAS{
 			client:               &testClient{},
 			certificateAuthority: testAuthorityName,
 		}, false},
 		{"ok with credentials", args{context.Background(), apiv1.Options{
-			Certificateauthority: testAuthorityName, CredentialsFile: "testdata/credentials.json",
+			CertificateAuthority: testAuthorityName, CredentialsFile: "testdata/credentials.json",
 		}}, &CloudCAS{
 			client:               &testClient{credentialsFile: "testdata/credentials.json"},
 			certificateAuthority: testAuthorityName,
 		}, false},
 		{"fail certificate authority", args{context.Background(), apiv1.Options{}}, nil, true},
 		{"fail with credentials", args{context.Background(), apiv1.Options{
-			Certificateauthority: testAuthorityName, CredentialsFile: "testdata/error.json",
+			CertificateAuthority: testAuthorityName, CredentialsFile: "testdata/error.json",
 		}}, nil, true},
 	}
 	for _, tt := range tests {
@@ -225,7 +225,7 @@ func TestNew_register(t *testing.T) {
 	}
 
 	got, err := newFn(context.Background(), apiv1.Options{
-		Certificateauthority: testAuthorityName, CredentialsFile: "testdata/credentials.json",
+		CertificateAuthority: testAuthorityName, CredentialsFile: "testdata/credentials.json",
 	})
 	if err != nil {
 		t.Errorf("New() error = %v", err)
@@ -255,10 +255,10 @@ func TestNew_real(t *testing.T) {
 		args     args
 		wantErr  bool
 	}{
-		{"fail default credentials", true, args{context.Background(), apiv1.Options{Certificateauthority: testAuthorityName}}, true},
+		{"fail default credentials", true, args{context.Background(), apiv1.Options{CertificateAuthority: testAuthorityName}}, true},
 		{"fail certificate authority", false, args{context.Background(), apiv1.Options{}}, true},
 		{"fail with credentials", false, args{context.Background(), apiv1.Options{
-			Certificateauthority: testAuthorityName, CredentialsFile: "testdata/missing.json",
+			CertificateAuthority: testAuthorityName, CredentialsFile: "testdata/missing.json",
 		}}, true},
 	}
 	for _, tt := range tests {