diff --git a/sys/opencrypto/ktls_ocf.c b/sys/opencrypto/ktls_ocf.c
--- a/sys/opencrypto/ktls_ocf.c
+++ b/sys/opencrypto/ktls_ocf.c
@@ -761,6 +761,9 @@
 		if (tls->params.tls_vminor == TLS_MINOR_VER_ZERO) {
 			os->implicit_iv = true;
 			memcpy(os->iv, tls->params.iv, AES_BLOCK_LEN);
+#ifdef INVARIANTS
+			os->next_seqno = tls->next_seqno;
+#endif
 		}
 	}