diff --git a/ext/calendar/tests/easter_date.phpt b/ext/calendar/tests/easter_date.phpt
index 065e1478d0b..4e0aaa137fc 100644
--- a/ext/calendar/tests/easter_date.phpt
+++ b/ext/calendar/tests/easter_date.phpt
@@ -2,6 +2,8 @@
 easter_date()
 --INI--
 date.timezone=UTC
+--ENV--
+TZ=UTC
 --SKIPIF--
 <?php include 'skipif.inc'; ?>
 --FILE--