diff --git a/src/Rules/ReservedUsername.php b/src/Rules/ReservedUsername.php
index 30451446..7b0a3607 100644
--- a/src/Rules/ReservedUsername.php
+++ b/src/Rules/ReservedUsername.php
@@ -4,11 +4,13 @@
 
 namespace ARKEcosystem\Fortify\Rules;
 
+use Illuminate\Support\Str;
+
 class ReservedUsername
 {
     public function passes($attribute, $value): bool
     {
-        return ! in_array($value, trans('fortify::username_blacklist'), true);
+        return ! in_array(Str::lower($value), trans('fortify::username_blacklist'), true);
     }
 
     public function message(): string
diff --git a/tests/Rules/ReservedUsernameTest.php b/tests/Rules/ReservedUsernameTest.php
index ae18e9d6..52e68f98 100644
--- a/tests/Rules/ReservedUsernameTest.php
+++ b/tests/Rules/ReservedUsernameTest.php
@@ -19,6 +19,12 @@
     'president',
     'server',
     'staff',
+    'Admin',
+    'RoOt',
+    'Www',
+    'PresIDent',
+    'ServEr',
+    'StAfF',
 ]);
 
 it('allows adding username that isn\'t blacklisted', function ($username) {