diff --git a/utils/reverseproxy_ssh_setup b/utils/reverseproxy_ssh_setup
index f55efe1..37ec202 100755
--- a/utils/reverseproxy_ssh_setup
+++ b/utils/reverseproxy_ssh_setup
@@ -35,4 +35,7 @@ iptables -F -t nat
 # Setup port redirect
 iptables -t nat -A PREROUTING -d $reverseproxy_ip/32 -p tcp -m tcp --dport 22 -j DNAT --to-destination $integration_ip:22
 iptables -t nat -A POSTROUTING -d $integration_ip/32 -p tcp -m tcp --dport 22 -j SNAT --to-source $reverseproxy_ip
-sysctl -w net.ipv4.ip_forward=1
+if ! grep -q '/$' /proc/1/cgroup; then
+  # only on non-containers
+  sysctl -w net.ipv4.ip_forward=1
+fi
--
libgit2 0.21.2