diff --git a/glib/tests/logging.c b/glib/tests/logging.c
index aece49048..8a6fe1650 100644
--- a/glib/tests/logging.c
+++ b/glib/tests/logging.c
@@ -261,6 +261,8 @@ bug653052 (void)
 int
 main (int argc, char *argv[])
 {
+  unsetenv ("G_MESSAGES_DEBUG");
+
   g_test_init (&argc, &argv, NULL);
   g_test_bug_base ("http://bugzilla.gnome.org/");