diff --git a/actionmailer/test/old_base/mail_service_test.rb b/actionmailer/test/old_base/mail_service_test.rb
index b68e7fcbac..32ed9fc870 100644
--- a/actionmailer/test/old_base/mail_service_test.rb
+++ b/actionmailer/test/old_base/mail_service_test.rb
@@ -674,7 +674,7 @@ The body
 EOF
     mail = Mail.new(msg)
     assert_equal "testing testing \326\244", mail.subject
-    assert_equal "Subject: testing\r\n\t=?UTF-8?Q?_testing_=D6=A4=?=\r\n", mail[:subject].encoded
+    assert_equal "Subject: testing =?UTF-8?Q?_testing_=D6=A4=?=\r\n", mail[:subject].encoded
   end
 
   def test_unquote_7bit_subject
@@ -863,7 +863,7 @@ EOF
 
   def test_multipart_with_utf8_subject
     mail = TestMailer.multipart_with_utf8_subject(@recipient)
-    regex = Regexp.escape('Subject: =?UTF-8?Q?Foo_=C3=A1=C3=AB=C3=B4_=C3=AE=C3=BC=?=')
+    regex = Regexp.escape('Subject: =?UTF-8?Q?Foo_=C3=A1=C3=AB=C3=B4=?= =?UTF-8?Q?_=C3=AE=C3=BC=?=')
     assert_match(/#{regex}/, mail.encoded)
     string = "Foo áëô îü"
     string.force_encoding('UTF-8') if string.respond_to?(:force_encoding)
@@ -872,7 +872,7 @@ EOF
 
   def test_implicitly_multipart_with_utf8
     mail = TestMailer.implicitly_multipart_with_utf8
-    regex = Regexp.escape('Subject: =?UTF-8?Q?Foo_=C3=A1=C3=AB=C3=B4_=C3=AE=C3=BC=?=')
+    regex = Regexp.escape('Subject: =?UTF-8?Q?Foo_=C3=A1=C3=AB=C3=B4=?= =?UTF-8?Q?_=C3=AE=C3=BC=?=')
     assert_match(/#{regex}/, mail.encoded)
     string = "Foo áëô îü"
     string.force_encoding('UTF-8') if string.respond_to?(:force_encoding)