diff -up squid-3.1.0.16/src/peer_select.cc.assert squid-3.1.0.16/src/peer_select.cc
--- squid-3.1.0.16/src/peer_select.cc.assert	2010-02-01 05:02:27.000000000 +0100
+++ squid-3.1.0.16/src/peer_select.cc	2010-02-05 15:27:09.000000000 +0100
@@ -67,6 +67,7 @@ const char *hier_strings[] = {
     "ANY_PARENT",
     "USERHASH",
     "SOURCEHASH",
+    "PINNED",
     "INVALID CODE"
 };