diff --git a/apps/user_ldap/lib/access.php b/apps/user_ldap/lib/access.php
index 6f6b8d0f01..52aa39012f 100644
--- a/apps/user_ldap/lib/access.php
+++ b/apps/user_ldap/lib/access.php
@@ -991,7 +991,7 @@ abstract class Access {
 	 * internally we store them for usage in LDAP filters
 	 */
 	private function DNasBaseParameter($dn) {
-		return str_replace('\\5c', '\\', $dn);
+		return str_ireplace('\\5c', '\\', $dn);
 	}
 
 	/**