diff --git a/apps/documenteditor/main/app/view/SignDialog.js b/apps/documenteditor/main/app/view/SignDialog.js
index 15a0d9176..49942e7d9 100644
--- a/apps/documenteditor/main/app/view/SignDialog.js
+++ b/apps/documenteditor/main/app/view/SignDialog.js
@@ -135,7 +135,8 @@ define([
 
             me.inputName = new Common.UI.InputField({
                 el          : $('#id-dlg-sign-name'),
-                style       : 'width: 100%;'
+                style       : 'width: 100%;',
+                validateOnChange: true
             }).on ('changing', _.bind(me.onChangeName, me));
 
             me.cmbFonts = new Common.UI.ComboBoxFonts({