diff --git a/src/messenger/webim/operator/operator.php b/src/messenger/webim/operator/operator.php
index ca50b4a5..5f871f69 100644
--- a/src/messenger/webim/operator/operator.php
+++ b/src/messenger/webim/operator/operator.php
@@ -38,7 +38,7 @@ if( isset($_POST['login']) && isset($_POST['password']) ) {
 
 	if( !$login ) {
 		$errors[] = no_field("form.field.login");
-	} else if( !preg_match( "/^[\w_]+$/",$login) ) {
+	} else if( !preg_match( "/^[\w_\.]+$/",$login) ) {
 		$errors[] = getlocal("page_agent.error.wrong_login");
 	}