diff --git a/docker/services/varnish b/docker/services/varnish
index 7749599..b356f61 100644
--- a/docker/services/varnish
+++ b/docker/services/varnish
@@ -4,7 +4,7 @@
       - "80:80/tcp"
       - "443:443/tcp"
       - "443:443/udp"
-    sysctl:
+    sysctls:
       net.ipv4.ip_unprivileged_port_start: 0
     environment:
       - VARNISH_SIZE=2G