diff --git a/regress/putty-kex.sh b/regress/putty-kex.sh
index 71c09701b..686d0e1af 100644
--- a/regress/putty-kex.sh
+++ b/regress/putty-kex.sh
@@ -1,4 +1,4 @@
-#	$OpenBSD: putty-kex.sh,v 1.4 2016/11/25 03:02:01 dtucker Exp $
+#	$OpenBSD: putty-kex.sh,v 1.5 2020/01/23 03:24:38 dtucker Exp $
 #	Placed in the Public Domain.
 
 tid="putty KEX"
@@ -8,7 +8,7 @@ if test "x$REGRESS_INTEROP_PUTTY" != "xyes" ; then
 	exit 0
 fi
 
-for k in dh-gex-sha1 dh-group1-sha1 dh-group14-sha1 ; do
+for k in dh-gex-sha1 dh-group1-sha1 dh-group14-sha1 ecdh ; do
 	verbose "$tid: kex $k"
 	cp ${OBJ}/.putty/sessions/localhost_proxy \
 	    ${OBJ}/.putty/sessions/kex_$k