diff --git a/lib/onelogin/saml/authrequest.rb b/lib/onelogin/saml/authrequest.rb
index bcc82d560..0260c45a8 100644
--- a/lib/onelogin/saml/authrequest.rb
+++ b/lib/onelogin/saml/authrequest.rb
@@ -6,7 +6,7 @@
 module Onelogin::Saml
   class Authrequest
     def create(settings, params = {})
-      uuid = "_".UUID.new.generate
+      uuid = "_" + UUID.new.generate
       time = Time.now.utc.strftime("%Y-%m-%dT%H:%M:%SZ")
 
       request =