diff --git a/telepathy-glib/text-mixin.c b/telepathy-glib/text-mixin.c
index 2fbd832..4a474b8 100644
--- a/telepathy-glib/text-mixin.c
+++ b/telepathy-glib/text-mixin.c
@@ -85,7 +85,7 @@ struct _TpTextMixinPrivate
 typedef struct
 {
     guint id;
-    time_t timestamp;
+    guint timestamp;
     TpHandle sender;
     TpChannelTextMessageType type;
     char *text;
@@ -298,7 +298,7 @@ tp_text_mixin_receive_with_flags (GObject *obj,
   /* FIXME: we don't check for overflow, so in highly pathological cases we
    * might end up with multiple messages with the same ID */
   msg->id = mixin->priv->recv_id++;
-  msg->timestamp = timestamp;
+  msg->timestamp = (guint) timestamp;
   msg->type = type;
   msg->flags = flags;