diff --git a/src/vnet/ipsec/ipsec_if.c b/src/vnet/ipsec/ipsec_if.c
index af61178..7d6c725 100644
--- a/src/vnet/ipsec/ipsec_if.c
+++ b/src/vnet/ipsec/ipsec_if.c
@@ -290,7 +290,7 @@
       if (args->udp_encap)
 	flags |= IPSEC_SA_FLAG_UDP_ENCAP;
       if (args->esn)
-	flags |= IPSEC_SA_FLAG_USE_EXTENDED_SEQ_NUM;
+	flags |= IPSEC_SA_FLAG_USE_ESN;
       if (args->anti_replay)
 	flags |= IPSEC_SA_FLAG_USE_ANTI_REPLAY;