diff --git a/tcsh.spec b/tcsh.spec
index 1faf5fa..22ac91e 100644
--- a/tcsh.spec
+++ b/tcsh.spec
@@ -44,7 +44,7 @@ like syntax.
 %patch9 -p1 -b .memoryuse
 %patch11 -p1 -b .order
 %patch28 -p1 -b .manpage-spelling
-#patch31 -p1 -b .history-file-locking
+%patch31 -p1 -b .history-file-locking
 
 for i in Fixes WishList; do
  iconv -f iso-8859-1 -t utf-8 "$i" > "${i}_" && \
@@ -120,6 +120,7 @@ fi
 %changelog
 * Mon Oct 29 2012 Roman Kollar <rkollar@redhat.com> - 6.18.00-4
 - Add Copyright file in %doc
+- Readd tcsh-6.18.00-history-file-locking.patch
 
 * Fri Aug 3 2012 Orion Poplawski <orion@nwra.com> - 6.18.00-3
 - Drop tcsh-6.18.00-history-file-locking.patch for now (bug 842851)