diff --git a/actionmailer/lib/action_mailer/vendor/tmail-1.2.3/tmail/parser.rb b/actionmailer/lib/action_mailer/vendor/tmail-1.2.3/tmail/parser.rb
index ab1a828471bdc..0ddc52521323a 100644
--- a/actionmailer/lib/action_mailer/vendor/tmail-1.2.3/tmail/parser.rb
+++ b/actionmailer/lib/action_mailer/vendor/tmail-1.2.3/tmail/parser.rb
@@ -43,6 +43,7 @@ module Racc
 
   class Parser
 
+    old_verbose, $VERBOSE = $VERBOSE, nil
     Racc_Runtime_Version = '1.4.5'
     Racc_Runtime_Revision = '$Revision: 1.7 $'.split[1]
 
@@ -71,6 +72,7 @@ class Parser
       Racc_Runtime_Core_Revision   = Racc_Runtime_Core_Revision_R
       Racc_Runtime_Type            = 'ruby'
     end
+    $VERBOSE = old_verbose
 
     def Parser.racc_runtime_type
       Racc_Runtime_Type