2.2 R5 loses its connection

I created a Tunnel from R5 to R4 over the serial 0/1/0 interfaces and used "ip unnumbered loopback 0" on each end. I then added

ip route 150.15.4.4 255.255.255.255 Serial0/1/0 250 on R5

and ip route 150.15.5.5 255.255.255.255 Serial0/1/0 250 on R4

OSPF comes up accross the tunnel and when R5 loses the connection to the frame relay all is good. This should be OK?