diff --git a/ChangeLog b/ChangeLog
index 61e3accf6..08776414c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -234,6 +234,7 @@
    Barton Meeks).
  + Fixed problem with duplicate 'project changed' messages (thanks to Owen
    Clarke).
+ + Fixed problem with non-UTC defaults for "TZ" (thanks to Owen Clarke).
 
 ------ old releases ------------------------------
 
diff --git a/src/Nibbler.cpp b/src/Nibbler.cpp
index 332ee159c..a51abfe02 100644
--- a/src/Nibbler.cpp
+++ b/src/Nibbler.cpp
@@ -672,7 +672,7 @@ bool Nibbler::getDateISO (time_t& t)
       tms.tm_sec   = second;
 
       char *tz = getenv ("TZ");
-      setenv ("TZ", "", 1);
+      setenv ("TZ", "UTC", 1);
       tzset ();
       t = mktime (&tms);
       if (tz)