diff --git a/install.sh b/install.sh
index 2059d18415..c2f10331cc 100755
--- a/install.sh
+++ b/install.sh
@@ -672,8 +672,8 @@ ip link delete cni0
 ip link delete flannel.1
 ip link delete flannel-v6.1
 rm -rf /var/lib/cni/
-iptables-save | grep -v KUBE- | grep -v CNI- | iptables-restore
-ip6tables-save | grep -v KUBE- | grep -v CNI- | ip6tables-restore
+iptables-save | grep -v KUBE- | grep -v CNI- | grep -v flannel | iptables-restore
+ip6tables-save | grep -v KUBE- | grep -v CNI- | grep -v flannel | ip6tables-restore
 EOF
     $SUDO chmod 755 ${KILLALL_K3S_SH}
     $SUDO chown root:root ${KILLALL_K3S_SH}
diff --git a/package/rpm/install.sh b/package/rpm/install.sh
index 2a10b38ab3..d8653e8019 100755
--- a/package/rpm/install.sh
+++ b/package/rpm/install.sh
@@ -563,8 +563,8 @@ ip link delete cni0
 ip link delete flannel.1
 ip link delete flannel-v6.1
 rm -rf /var/lib/cni/
-iptables-save | grep -v KUBE- | grep -v CNI- | iptables-restore
-ip6tables-save | grep -v KUBE- | grep -v CNI- | ip6tables-restore
+iptables-save | grep -v KUBE- | grep -v CNI- | grep -v flannel | iptables-restore
+ip6tables-save | grep -v KUBE- | grep -v CNI- | grep -v flannel | ip6tables-restore
 EOF
     $SUDO chmod 755 ${KILLALL_K3S_SH}
     $SUDO chown root:root ${KILLALL_K3S_SH}