diff --git a/src/libcharon/plugins/updown/updown_listener.c b/src/libcharon/plugins/updown/updown_listener.c
index 2c3f93298..200f298a1 100644
--- a/src/libcharon/plugins/updown/updown_listener.c
+++ b/src/libcharon/plugins/updown/updown_listener.c
@@ -344,12 +344,12 @@ METHOD(listener_t, child_updown, bool,
 				"PLUTO_UNIQUEID='%u' "
 				"PLUTO_ME='%H' "
 				"PLUTO_MY_ID='%Y' "
-				"PLUTO_MY_CLIENT='%H/%u' "
+				"PLUTO_MY_CLIENT='%+H/%u' "
 				"PLUTO_MY_PORT='%u' "
 				"PLUTO_MY_PROTOCOL='%u' "
 				"PLUTO_PEER='%H' "
 				"PLUTO_PEER_ID='%Y' "
-				"PLUTO_PEER_CLIENT='%H/%u' "
+				"PLUTO_PEER_CLIENT='%+H/%u' "
 				"PLUTO_PEER_PORT='%u' "
 				"PLUTO_PEER_PROTOCOL='%u' "
 				"%s"