diff --git a/glib/tests/markup-parse.c b/glib/tests/markup-parse.c
index 7c1a0442f..5adc2721b 100644
--- a/glib/tests/markup-parse.c
+++ b/glib/tests/markup-parse.c
@@ -281,6 +281,7 @@ main (int argc, char *argv[])
   const gchar *name;
   gchar *path;
 
+  g_setenv ("LANG", "en_US.utf-8", TRUE);
   setlocale (LC_ALL, "");
 
   g_test_init (&argc, &argv, NULL);