diff --git a/docker/nginx/proxy.conf b/docker/nginx/proxy.conf
index bc22ea34..6830cd5f 100644
--- a/docker/nginx/proxy.conf
+++ b/docker/nginx/proxy.conf
@@ -33,7 +33,7 @@ real_ip_header X-Forwarded-For;
 
 set_real_ip_from 10.0.0.0/8;
 set_real_ip_from 172.16.0.0/12;
-set_real_ip_from 172.18.0.0/12;
+set_real_ip_from 172.18.0.0;
 set_real_ip_from 192.168.0.0/24;
 set_real_ip_from 127.0.0.0/8;