diff --git a/mutt-1.5.21-pophash.patch b/mutt-1.5.21-pophash.patch
new file mode 100644
index 0000000..5540e97
--- /dev/null
+++ b/mutt-1.5.21-pophash.patch
@@ -0,0 +1,19 @@
+diff -up mutt/pop.c.pophash mutt/pop.c
+--- mutt/pop.c.pophash	2009-12-14 19:24:59.000000000 +0100
++++ mutt/pop.c	2011-10-04 16:51:23.307236908 +0200
+@@ -618,8 +618,15 @@ int pop_fetch_message (MESSAGE* msg, CON
+   }
+   rewind (msg->fp);
+   uidl = h->data;
++  
++  /* we replace envelop, key in subj_hash has to be updated as well */
++  if (ctx->subj_hash && h->env->real_subj)
++    hash_delete (ctx->subj_hash, h->env->real_subj, h, NULL);
+   mutt_free_envelope (&h->env);
+   h->env = mutt_read_rfc822_header (msg->fp, h, 0, 0);
++  if (ctx->subj_hash && h->env->real_subj)
++    hash_insert (ctx->subj_hash, h->env->real_subj, h, 1);
++
+   h->data = uidl;
+   h->lines = 0;
+   fgets (buf, sizeof (buf), msg->fp);
diff --git a/mutt.spec b/mutt.spec
index c3bbe9e..bd1400d 100644
--- a/mutt.spec
+++ b/mutt.spec
@@ -32,6 +32,7 @@ Patch6: mutt-1.5.21-hdrcnt.patch
 Patch7: mutt-1.5.21-testcert.patch
 Patch8: mutt-1.5.21-cabundle.patch
 Patch9: mutt-1.5.21-gpgme-1.2.0.patch
+Patch10: mutt-1.5.21-pophash.patch
 Url: http://www.mutt.org/
 Requires: mailcap urlview
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -76,6 +77,7 @@ for selecting groups of messages.
 %patch7 -p1 -b .testcert
 %patch8 -p1 -b .cabundle
 %patch9 -p1 -b .gpgme-1.2.0
+%patch10 -p1 -b .pophash
 
 sed -i.gpgerror 's/`$GPGME_CONFIG --libs`/"\0 -lgpg-error"/' configure
 
@@ -161,6 +163,8 @@ rm -rf $RPM_BUILD_ROOT
 * Thu Oct 27 2011 Honza Horak <hhorak@redhat.com> - 5:1.5.21-7
 - Removed ca-bundle.crt since it is outdated (rhbz#734379)
 - Build with gpgme support by default (rhbz#748337)
+- Fixed segmentation fault during messages removal in thread mode
+  (rhbz#674271)
 
 * Wed Jun 29 2011 Honza Horak <hhorak@redhat.com> - 5:1.5.21-6
 - Fixed message indexes when skipping fetch response (mutt bug #3288)