diff --git a/app/views/projects/invite_members_by_mail.html.erb b/app/views/projects/invite_members_by_mail.html.erb
index e6bb1be4e..2d79188e6 100644
--- a/app/views/projects/invite_members_by_mail.html.erb
+++ b/app/views/projects/invite_members_by_mail.html.erb
@@ -55,7 +55,7 @@
 		</div>
 			<%= form_tag('send_mail_to_member', :controller => 'projects',:action => 'send_mail_to_member', method: 'get') do %>
 				<span id="valid_email" style="color: #FF0000;"></span>
-                <%= text_field_tag 'mail',  '', :class => "fb_item fl", :placeholder => l(:label_input_email), :onkeyup => "verifyAddress();" %>
+                <%= text_field_tag 'mail',  '', :class => "fb_item fl", :placeholder => l(:label_input_email), :onblur => "verifyAddress();" %>
                 <div class="cl"></div>
                 <div class="cl"></div>
                 <a href="#" class="btn_free" onclick="senderEmail($(this));">