diff --git a/test/notmuch-test b/test/notmuch-test
index 6d14e71d..5463cf21 100755
--- a/test/notmuch-test
+++ b/test/notmuch-test
@@ -392,7 +392,7 @@ Subject: Re: notmuch-reply-test
 To: Sender <sender@example.com>
 Bcc: test_suite@notmuchmail.org
 In-Reply-To: <${gen_msg_id}>
-References:  <${gen_msg_id}>
+References: <${gen_msg_id}>
 
 On Tue, 05 Jan 2010 15:43:56 -0800, Sender <sender@example.com> wrote:
 > basic reply test"
@@ -409,7 +409,7 @@ Subject: Re: notmuch-reply-test
 To: Sender <sender@example.com>, Someone Else <someone@example.com>
 Bcc: test_suite@notmuchmail.org
 In-Reply-To: <${gen_msg_id}>
-References:  <${gen_msg_id}>
+References: <${gen_msg_id}>
 
 On Tue, 05 Jan 2010 15:43:56 -0800, Sender <sender@example.com> wrote:
 > Multiple recipients"
@@ -428,7 +428,7 @@ To: Sender <sender@example.com>
 Cc: Other Parties <cc@example.com>
 Bcc: test_suite@notmuchmail.org
 In-Reply-To: <${gen_msg_id}>
-References:  <${gen_msg_id}>
+References: <${gen_msg_id}>
 
 On Tue, 05 Jan 2010 15:43:56 -0800, Sender <sender@example.com> wrote:
 > reply with CC"
@@ -445,7 +445,7 @@ Subject: Re: notmuch-reply-test
 To: Sender <sender@example.com>
 Bcc: test_suite@notmuchmail.org
 In-Reply-To: <${gen_msg_id}>
-References:  <${gen_msg_id}>
+References: <${gen_msg_id}>
 
 On Tue, 05 Jan 2010 15:43:56 -0800, Sender <sender@example.com> wrote:
 > reply from alternate address"
@@ -463,7 +463,7 @@ Subject: Re: notmuch-reply-test
 To: Sender <elsewhere@example.com>
 Bcc: test_suite@notmuchmail.org
 In-Reply-To: <${gen_msg_id}>
-References:  <${gen_msg_id}>
+References: <${gen_msg_id}>
 
 On Tue, 05 Jan 2010 15:43:56 -0800, Sender <sender@example.com> wrote:
 > support for reply-to"
@@ -481,7 +481,7 @@ Subject: Re: notmuch-reply-test
 To: Sender <sender@example.com>, Some List <list@example.com>
 Bcc: test_suite@notmuchmail.org
 In-Reply-To: <${gen_msg_id}>
-References:  <${gen_msg_id}>
+References: <${gen_msg_id}>
 
 On Tue, 05 Jan 2010 15:43:56 -0800, Sender <sender@example.com> wrote:
 > Un-munging Reply-To"