diff --git a/includes/model/User_model.php b/includes/model/User_model.php
index 6cf1c2d7..2d1767e6 100644
--- a/includes/model/User_model.php
+++ b/includes/model/User_model.php
@@ -273,7 +273,7 @@ function User_ids()
  */
 function User_validate_Nick($nick)
 {
-    return preg_replace('/([^\p{L}\p{N}-_ ]+)/ui', '', trim($nick));
+    return preg_replace('/([^\p{L}\p{N}-_. ]+)/ui', '', trim($nick));
 }
 
 /**