diff --git a/sdk/azidentity/client_certificate_credential_test.go b/sdk/azidentity/client_certificate_credential_test.go
index 32d08500d5e1..d3859057aaab 100644
--- a/sdk/azidentity/client_certificate_credential_test.go
+++ b/sdk/azidentity/client_certificate_credential_test.go
@@ -311,6 +311,12 @@ func TestClientCertificateCredential_Regional(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
+
+	// regional STS returns an error for CP1
+	before := disableCP1
+	defer func() { disableCP1 = before }()
+	disableCP1 = true
+
 	cred, err := NewClientCertificateCredential(
 		liveSP.tenantID, liveSP.clientID, cert, key, &ClientCertificateCredentialOptions{SendCertificateChain: true, ClientOptions: opts},
 	)