diff --git a/glib/gdate.c b/glib/gdate.c
index ffc21f1b9..ed25ec308 100644
--- a/glib/gdate.c
+++ b/glib/gdate.c
@@ -1392,6 +1392,7 @@ _g_localtime (time_t timet, struct tm *out_tm)
   gboolean success = TRUE;
 
 #ifdef HAVE_LOCALTIME_R
+  tzset ();
   if (!localtime_r (&timet, out_tm))
     success = FALSE;
 #else