diff --git a/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c b/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c
index 3fec329b2..493a22910 100644
--- a/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c
+++ b/src/libcharon/plugins/kernel_netlink/kernel_netlink_ipsec.c
@@ -1724,11 +1724,6 @@ METHOD(kernel_ipsec_t, add_sa, status_t,
 	sa->family = id->src->get_family(id->src);
 	sa->mode = mode2kernel(mode);
 
-	if (!data->copy_df)
-	{
-		sa->flags |= XFRM_STATE_NOPMTUDISC;
-	}
-
 	if (!data->copy_ecn)
 	{
 		sa->flags |= XFRM_STATE_NOECN;
@@ -1748,6 +1743,10 @@ METHOD(kernel_ipsec_t, add_sa, status_t,
 	}
 	else
 	{
+		if (!data->copy_df)
+		{
+			sa->flags |= XFRM_STATE_NOPMTUDISC;
+		}
 		switch (data->copy_dscp)
 		{
 			case DSCP_COPY_IN_ONLY: