diff --git a/src/ChangeLog b/src/ChangeLog
index 01862b689f8..2481177f465 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,10 @@
+2013-01-12  Paul Eggert  <eggert@cs.ucla.edu>
+
+	Fix bug with set-time-zone-rule and LOCALTIME_CACHE (Bug#13415).
+	* editfns.c (set_time_zone_rule) [LOCALTIME_CACHE]:
+	Clear tzvalbuf_in_environ if this workaround is in effect.
+	Problem and fix reported by Kazuhiro Ito.
+
 2013-01-11  Aaron S. Hawley  <Aaron.Hawley@vtinfo.com>
 
 	* insdel.c (Fcombine_after_change_execute, syms_of_insdel): Fix
diff --git a/src/editfns.c b/src/editfns.c
index 64269bab8df..bf19acb42a8 100644
--- a/src/editfns.c
+++ b/src/editfns.c
@@ -2188,6 +2188,7 @@ set_time_zone_rule (const char *tzstring)
       xputenv (set_time_zone_rule_tz[1]);
     }
   tzset ();
+  tzvalbuf_in_environ = 0;
 #endif
 
   if (!tzstring)