diff --git a/lib/pubsuffix-psl.js b/lib/pubsuffix-psl.js
index bf416511..83398555 100644
--- a/lib/pubsuffix-psl.js
+++ b/lib/pubsuffix-psl.js
@@ -60,7 +60,7 @@ function getPublicSuffix(domain, options = {}) {
 
   if (!ignoreError && SPECIAL_USE_DOMAINS.includes(topLevelDomain)) {
     if (allowSpecialUseDomain) {
-      return "";
+      return topLevelDomain;
     }
     throw new Error(
       `Cookie has domain set to the public suffix "${topLevelDomain}" which is a special use domain. To allow this, configure your CookieJar with {allowSpecialUseDomain:true, rejectPublicSuffixes: false}.`