diff --git a/glib/grand.c b/glib/grand.c
index 2ac4a4ec6..15d15ba5d 100644
--- a/glib/grand.c
+++ b/glib/grand.c
@@ -207,7 +207,7 @@ g_rand_new (void)
   if (!dev_urandom_exists)
     {
       gint64 now_us = g_get_real_time ();
-      seed[0] = now_us / G_USEC_PER_SEC;
+      seed[0] = (guint32) (now_us / G_USEC_PER_SEC);
       seed[1] = now_us % G_USEC_PER_SEC;
       seed[2] = getpid ();
       seed[3] = getppid ();