diff --git a/configure.ac b/configure.ac
index fd1132fda..2052c9730 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,8 +3,8 @@ dnl STATUS: "X" for prerelease beta builds,
 dnl         "Z" for unsupported trunk builds,
 dnl         "0" for stable, supported releases
 dnl these should be the only two lines you need to change
-m4_define([user_agent_prefix],[3.00])
-m4_define([peer_id_prefix],[-TR3000-])
+m4_define([user_agent_prefix],[3.00+])
+m4_define([peer_id_prefix],[-TR300Z-])
 
 AC_INIT([transmission],[user_agent_prefix],[https://github.com/transmission/transmission])
 AC_SUBST(USERAGENT_PREFIX,[user_agent_prefix])