diff --git a/ipv4-rules.sh b/ipv4-rules.sh
index 25f6739..fa4e69c 100755
--- a/ipv4-rules.sh
+++ b/ipv4-rules.sh
@@ -132,7 +132,7 @@ function addHetzner() {
 }
 
 function setSysctlValues() {
-  sysctl -q -w net.netfilter.nf_conntrack_max=$((2 ** 21))
+  sysctl -q -w net.netfilter.nf_conntrack_max=$((2 ** 21)) || sysctl -q -w net.nf_conntrack_max=$((2 ** 21))
   sysctl -q -w net.ipv4.tcp_syncookies=1
 
   # make tcp_max_syn_backlog big enough to have ListenDrops being low or 0: