diff --git a/docker/services/tinc b/docker/services/tinc
index 134f155..fd4f246 100644
--- a/docker/services/tinc
+++ b/docker/services/tinc
@@ -15,5 +15,8 @@
     networks:
       internal:
         ipv4_address: ${internal_address}
+{{ if len "${internal_address6:-}" }}
+        ipv6_address: ${internal_address6}
+{{ end }}
     sysctls:
       - net.ipv6.conf.${netname}.disable_ipv6=1