diff --git a/network/vif-route-qubes b/network/vif-route-qubes
index b7dbb21..feedf77 100755
--- a/network/vif-route-qubes
+++ b/network/vif-route-qubes
@@ -63,5 +63,7 @@ fi
 log debug "Successful vif-route-qubes $command for $vif."
 if [ "$command" = "online" ]
 then
+  # disable tx checksumming offload, apparently it doesn't work with our ancient qemu in stubdom
+  do_without_error ethtool -K $vif tx off
   success
 fi