diff --git a/FIX b/FIX
index 5846e5e..9cd7421 100644
--- a/FIX
+++ b/FIX
@@ -1,16 +1 @@
-mime filters are more strict with ltn12 standards
-ltn12 avoids coroutines (so you can go wild on the C side)
-automated tests for ftp now in use
-new compat-5.1 distribution
-    instalation should use new directory structure
-    namespace hierarchy is in now back in use (socket.url instead of url)
-    globals not visible from inside namespaces
-    all modules call "require" even for standard libraries
-kludge on wsocket.c:sock_send for windows moved to buffer.c:sendraw
-socket.protect only catches errors thrown by socke.try
-udp:sendto was calling sock_send
-close wasn't returning 1
-gettime returns time since Unix Epoch 1/1/1970 (UTC)
-sleep is robust to interrupts
-select had a stupid bug
-http.PROXY etc wasn't working
+tcp:shutdown() was checking for group instead of class.
diff --git a/src/tcp.c b/src/tcp.c
index 618f4ce..0b3706b 100644
--- a/src/tcp.c
+++ b/src/tcp.c
@@ -91,8 +91,6 @@ int tcp_open(lua_State *L)
     aux_add2group(L, "tcp{master}", "tcp{any}");
     aux_add2group(L, "tcp{client}", "tcp{any}");
     aux_add2group(L, "tcp{server}", "tcp{any}");
-    aux_add2group(L, "tcp{client}", "tcp{client,server}");
-    aux_add2group(L, "tcp{server}", "tcp{client,server}");
     /* define library functions */
     luaL_openlib(L, NULL, func, 0); 
     return 0;
@@ -261,7 +259,7 @@ static int meth_listen(lua_State *L)
 \*-------------------------------------------------------------------------*/
 static int meth_shutdown(lua_State *L)
 {
-    p_tcp tcp = (p_tcp) aux_checkgroup(L, "tcp{client}", 1);
+    p_tcp tcp = (p_tcp) aux_checkclass(L, "tcp{client}", 1);
     const char *how = luaL_optstring(L, 2, "both");
     switch (how[0]) {
         case 'b':