diff -up cups-1.5.0/cups/http-addr.c.loopback cups-1.5.0/cups/http-addr.c
--- cups-1.5.0/cups/http-addr.c.loopback	2011-10-05 17:48:36.469794399 +0100
+++ cups-1.5.0/cups/http-addr.c	2011-10-05 17:48:52.293500663 +0100
@@ -147,7 +147,9 @@ httpAddrLocalhost(
 
 #ifdef AF_INET6
   if (addr->addr.sa_family == AF_INET6 &&
-      IN6_IS_ADDR_LOOPBACK(&(addr->ipv6.sin6_addr)))
+      (IN6_IS_ADDR_LOOPBACK(&(addr->ipv6.sin6_addr)) ||
+       (IN6_IS_ADDR_V4COMPAT(&(addr->ipv6.sin6_addr)) &&
+	addr->ipv6.sin6_addr.s6_addr[12] == 0x7f)))
     return (1);
 #endif /* AF_INET6 */