1 files changed, 2 insertions, 0 deletions
diff --git a/mysql-test/mysql-test-run.pl b/mysql-test/mysql-test-run.pl
index bc2061a506c..ecdd57c83e5 100755
--- a/mysql-test/mysql-test-run.pl
+++ b/mysql-test/mysql-test-run.pl
@@ -3457,6 +3457,8 @@ sub run_testcase ($$) {
   my $timezone= timezone($tinfo);
   if ($timezone ne 'DEFAULT') {
     $ENV{'TZ'}= $timezone;
+  } else {
+    delete($ENV{'TZ'});
   }
   mtr_verbose("Setting timezone: $timezone");