diff --git a/plugins/provider/sip/calls-sip-origin.c b/plugins/provider/sip/calls-sip-origin.c
index ad56127..ea65597 100644
--- a/plugins/provider/sip/calls-sip-origin.c
+++ b/plugins/provider/sip/calls-sip-origin.c
@@ -365,7 +365,7 @@ dial (CallsOrigin *origin,
     dial_target = g_strdup (address);
   } else {
     if (self->port > 0)
-      dial_target = g_strconcat (address, "@", self->host, ":", self->port, NULL);
+      dial_target = g_strdup_printf ("%s@%s:%d", address, self->host, self->port);
     else
       dial_target = g_strconcat (address, "@", self->host, NULL);
   }