diff --git a/src/debian/debian_ts_nftables.conf b/src/debian/debian_ts_nftables.conf
index a1c73ad..c00146d 100644
--- a/src/debian/debian_ts_nftables.conf
+++ b/src/debian/debian_ts_nftables.conf
@@ -132,11 +132,6 @@ table inet router {
     # Mangle rules
     #
 
-    chain mangle_prerouting {
-        type filter hook prerouting priority mangle; policy accept;
-        ct state invalid counter drop comment "defconf: drop packets in invalid flow state"
-    }
-
     chain mangle_postrouting {
         type filter hook postrouting priority mangle; policy accept;
         oifname "eth0" tcp flags syn / fin,syn,rst tcp option maxseg size set rt mtu comment "defconf: zone LAN IPv4 / IPv6 egress MTU fixing"