diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4292b01a..7d1fadd3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 1. [](#bugfix)
     * Regression: Fixed fatal error in admin if POST request has `data` in it [#2074](https://github.com/getgrav/grav-plugin-admin/issues/2074)
     * Fixed Admin creating empty `user/config/info.yaml` file (the file can be safely removed, it is not in use)
+    * Fixed ACL for users with mixed case usernames [#2073](https://github.com/getgrav/grav-plugin-admin/issues/2073)
 
 # v1.10.4
 ## 02/17/2021
diff --git a/classes/plugin/Admin.php b/classes/plugin/Admin.php
index eda72374..6a448c9d 100644
--- a/classes/plugin/Admin.php
+++ b/classes/plugin/Admin.php
@@ -153,7 +153,7 @@ class Admin
             $directory = $managed ? $flex->getDirectory('user-accounts') : null;
 
             /** @var UserObject|null $test */
-            $test = $directory ? $directory->getObject($user->username) : null;
+            $test = $directory ? $directory->getObject(mb_strtolower($user->username)) : null;
             if ($test) {
                 $test = clone $test;
                 $test->access = $user->access;