diff --git a/templates/ipsec.conf.jinja2 b/templates/ipsec.conf.jinja2
index a532b7d21d95e166bb6856b4e3c3e2f6daef9467..3c4f65b87900fdbb94664fd83608b18f0c4f9db9 100644
--- a/templates/ipsec.conf.jinja2
+++ b/templates/ipsec.conf.jinja2
@@ -10,7 +10,7 @@ conn tunnel
     rekeymargin = 2m
     keyingtries = 1
     mobike = no
-    keyexchange = ike
+    keyexchange = ikev1
     ike = aes128-sha256-ecp256
     esp = aes128-sha256-ecp256
     left = {{ static_ipv4 }}