diff --git a/lib/public_ip.sh b/lib/public_ip.sh
index 0c2a596..dba2c93 100644
--- a/lib/public_ip.sh
+++ b/lib/public_ip.sh
@@ -12,7 +12,7 @@ function add_public_ip {
     ip -n "${vpc_name}" r add default via "${host_ip}"
 
     ip netns exec "${vpc_name}" iptables -t nat -A PREROUTING -d "${public_ip}/32" -j DNAT --to-destination "${private_ip}"
-    ip netns exec "${vpc_name}" iptables -t nat -A POSTROUTING -s "${private_ip}/32" -o br-public --to-source "${public_ip}" -j SNAT
+    ip netns exec "${vpc_name}" iptables -t nat -A POSTROUTING -s "${private_ip}/32" -o br-public -j SNAT --to-source "${public_ip}"
 }
 
 function delete_public_ip {
@@ -24,5 +24,5 @@ function delete_public_ip {
     ip                  r del "${public_ip}" dev br-public
 
     ip netns exec "${vpc_name}" iptables -t nat -D PREROUTING -d "${public_ip}/32" -j DNAT --to-destination "${private_ip}"
-    ip netns exec "${vpc_name}" iptables -t nat -D POSTROUTING -s "${private_ip}/32" -o br-public --to-source "${public_ip}" -j SNAT
+    ip netns exec "${vpc_name}" iptables -t nat -D POSTROUTING -s "${private_ip}/32" -o br-public -j SNAT --to-source "${public_ip}"
 }
\ No newline at end of file