diff --git a/tests/test-event.c b/tests/test-event.c
index 956eab56..87b28e51 100644
--- a/tests/test-event.c
+++ b/tests/test-event.c
@@ -221,6 +221,8 @@ gint
 main (gint   argc,
       gchar *argv[])
 {
+  g_setenv ("TZ", "UTC", TRUE);
+
   g_test_init (&argc, &argv, NULL);
 
   g_test_add_func ("/event/new", event_new);