diff --git a/src/libs/LoginUtils.ts b/src/libs/LoginUtils.ts
index 646bd00c35af..b900b6286edf 100644
--- a/src/libs/LoginUtils.ts
+++ b/src/libs/LoginUtils.ts
@@ -8,6 +8,8 @@ import {clearSignInData, setAccountError} from './actions/Session';
 import Navigation from './Navigation/Navigation';
 import {parsePhoneNumber} from './PhoneNumber';
 
+const PRIVATE_DOMAINS_SET = new Set(PUBLIC_DOMAINS);
+
 let countryCodeByIP: number;
 Onyx.connect({
     key: ONYXKEYS.COUNTRY_CODE,
@@ -40,7 +42,7 @@ function appendCountryCode(phone: string): string {
  */
 function isEmailPublicDomain(email: string): boolean {
     const emailDomain = Str.extractEmailDomain(email).toLowerCase();
-    return (PUBLIC_DOMAINS as readonly string[]).includes(emailDomain);
+    return PRIVATE_DOMAINS_SET.has(emailDomain);
 }
 
 /**