diff --git a/tinc/tinc-up.tmpl b/tinc/tinc-up.tmpl
index c613524..f72ac7a 100644
--- a/tinc/tinc-up.tmpl
+++ b/tinc/tinc-up.tmpl
@@ -2,7 +2,7 @@
 sysctl -w net.ipv6.conf.\$INTERFACE.disable_ipv6=1 || echo "[WARNING] IPv6 couldn't be disabled on the \$INTERFACE interface!"
 
 {{ if len "${internal_address6:-}" }}
-ifconfig ${internal_interface} ${internal_address6}
+ifconfig ${internal_interface} ${internal_address6}/${internal_mask6:-128}
 {{ end }}