diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index 352f9bd1..f6873794 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -192,6 +192,7 @@ in
         iptables -w -N pccw-sucks
         iptables -A pccw-sucks -o ${netifSit} -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1440
         iptables -A pccw-sucks -o ${netifAlt} -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1380
+        iptables -A pccw-sucks -o ${netifUSA} -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss 1380
         iptables -w -A FORWARD -j pccw-sucks
       '';
       extraStopCommands = ''