diff --git a/src/Symfony/Component/Ldap/CHANGELOG.md b/src/Symfony/Component/Ldap/CHANGELOG.md
index fbfe926ac4e0e..e552f5cff5e20 100644
--- a/src/Symfony/Component/Ldap/CHANGELOG.md
+++ b/src/Symfony/Component/Ldap/CHANGELOG.md
@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * Added the "extra_fields" option, an array of custom fields to pull from the LDAP server
+ * Added option to allow consumers to force attribute keys to be lowercase when utilizing the Entry class.
 
 4.3.0
 -----
diff --git a/src/Symfony/Component/Ldap/Entry.php b/src/Symfony/Component/Ldap/Entry.php
index af0edbd1f33ef..b51bab310b0eb 100644
--- a/src/Symfony/Component/Ldap/Entry.php
+++ b/src/Symfony/Component/Ldap/Entry.php
@@ -18,11 +18,16 @@ class Entry
 {
     private $dn;
     private $attributes;
+    private $force_lowercase_attributes;
 
-    public function __construct(string $dn, array $attributes = [])
+    public function __construct(string $dn, array $attributes = [], bool $force_lowercase_attributes = false)
     {
         $this->dn = $dn;
         $this->attributes = $attributes;
+
+        if ($force_lowercase_attributes) {
+            $this->attributes = array_change_key_case($attributes);
+        }
     }
 
     /**