diff --git a/workflow/engine/templates/admin/pmGmail.js b/workflow/engine/templates/admin/pmGmail.js
index 75fc79c04..2f867d4b1 100644
--- a/workflow/engine/templates/admin/pmGmail.js
+++ b/workflow/engine/templates/admin/pmGmail.js
@@ -91,6 +91,7 @@ Ext.onReady(function(){
                         if (checked) {
                             Ext.getCmp('typeAuthentication').enable();
                             Ext.getCmp('typeAuthentication').show();
+                            Ext.getCmp('typeAuthentication').clearValue();
                         } else {
                             Ext.MessageBox.confirm(
                                 _('ID_CONFIRM'),