diff --git a/src/cli/one_helper.rb b/src/cli/one_helper.rb
index 7ab77512f8..bfd52313e9 100644
--- a/src/cli/one_helper.rb
+++ b/src/cli/one_helper.rb
@@ -375,7 +375,7 @@ EOT
     def OpenNebulaHelper.update_template(id, resource)
         require 'tempfile'
 
-        tmp  = Tempfile.new(id)
+        tmp  = Tempfile.new(id.to_s)
         path = tmp.path
 
         tmp << resource.template_str