diff --git a/manifests/instance.pp b/manifests/instance.pp
index b55ce7e..de27bd1 100644
--- a/manifests/instance.pp
+++ b/manifests/instance.pp
@@ -91,7 +91,7 @@ define tinc::instance(
     if $tinc_address {
       $host_address = $tinc_address
     } else {
-      $int_name_escaped = regsubst($tinc_interface,'.','_','G')
+      $int_name_escaped = regsubst($tinc_interface,'\.','_','G')
       $host_address = getvar("::ipaddress_${int_name_escaped}")
     }