diff --git a/roles/exit-ip/templates/rules.v4.j2 b/roles/exit-ip/templates/rules.v4.j2
index 50a09d6..87b9150 100644
--- a/roles/exit-ip/templates/rules.v4.j2
+++ b/roles/exit-ip/templates/rules.v4.j2
@@ -4,7 +4,7 @@
 :INPUT ACCEPT [1:136]
 :OUTPUT ACCEPT [2:472]
 :POSTROUTING ACCEPT [0:0]
--A POSTROUTING -o eth0 -j MASQUERADE
+-A POSTROUTING -o {{ ansible_default_ipv4.interface }} -j MASQUERADE
 COMMIT
 *filter
 :INPUT ACCEPT [1124:131621]