diff --git a/testing/tests/ikev1/net2net-pgp-v3/hosts/moon/etc/strongswan.conf b/testing/tests/ikev1/net2net-pgp-v3/hosts/moon/etc/strongswan.conf
index 3787445e3..30c802be8 100644
--- a/testing/tests/ikev1/net2net-pgp-v3/hosts/moon/etc/strongswan.conf
+++ b/testing/tests/ikev1/net2net-pgp-v3/hosts/moon/etc/strongswan.conf
@@ -1,7 +1,7 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 pluto {
-  load = sha1 sha2 md5 aes des hmac pem pgp gmp random curl
+  load = sha1 sha2 md5 aes des hmac pem pkcs1 pgp gmp random curl
 }
 
 # pluto uses optimized DH exponent sizes (RFC 3526)
diff --git a/testing/tests/ikev1/net2net-pgp-v3/hosts/sun/etc/strongswan.conf b/testing/tests/ikev1/net2net-pgp-v3/hosts/sun/etc/strongswan.conf
index 3787445e3..30c802be8 100644
--- a/testing/tests/ikev1/net2net-pgp-v3/hosts/sun/etc/strongswan.conf
+++ b/testing/tests/ikev1/net2net-pgp-v3/hosts/sun/etc/strongswan.conf
@@ -1,7 +1,7 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 pluto {
-  load = sha1 sha2 md5 aes des hmac pem pgp gmp random curl
+  load = sha1 sha2 md5 aes des hmac pem pkcs1 pgp gmp random curl
 }
 
 # pluto uses optimized DH exponent sizes (RFC 3526)
diff --git a/testing/tests/ikev1/net2net-pgp-v4/hosts/moon/etc/strongswan.conf b/testing/tests/ikev1/net2net-pgp-v4/hosts/moon/etc/strongswan.conf
index 3787445e3..30c802be8 100644
--- a/testing/tests/ikev1/net2net-pgp-v4/hosts/moon/etc/strongswan.conf
+++ b/testing/tests/ikev1/net2net-pgp-v4/hosts/moon/etc/strongswan.conf
@@ -1,7 +1,7 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 pluto {
-  load = sha1 sha2 md5 aes des hmac pem pgp gmp random curl
+  load = sha1 sha2 md5 aes des hmac pem pkcs1 pgp gmp random curl
 }
 
 # pluto uses optimized DH exponent sizes (RFC 3526)
diff --git a/testing/tests/ikev1/net2net-pgp-v4/hosts/sun/etc/strongswan.conf b/testing/tests/ikev1/net2net-pgp-v4/hosts/sun/etc/strongswan.conf
index 3787445e3..30c802be8 100644
--- a/testing/tests/ikev1/net2net-pgp-v4/hosts/sun/etc/strongswan.conf
+++ b/testing/tests/ikev1/net2net-pgp-v4/hosts/sun/etc/strongswan.conf
@@ -1,7 +1,7 @@
 # /etc/strongswan.conf - strongSwan configuration file
 
 pluto {
-  load = sha1 sha2 md5 aes des hmac pem pgp gmp random curl
+  load = sha1 sha2 md5 aes des hmac pem pkcs1 pgp gmp random curl
 }
 
 # pluto uses optimized DH exponent sizes (RFC 3526)