diff --git a/include/net/netfilter/nf_nat.h b/include/net/netfilter/nf_nat.h
index e966092a36f1ef6eacd8207f1060e9f8eea0b309..aff80b190c1231a8eb5cae1b61b34007c833d870 100644
--- a/include/net/netfilter/nf_nat.h
+++ b/include/net/netfilter/nf_nat.h
@@ -56,7 +56,9 @@ struct nf_nat_multi_range_compat {
 /* per conntrack: nat application helper private data */
 union nf_conntrack_nat_help {
 	/* insert nat helper private data here */
+#if defined(CONFIG_NF_NAT_PPTP) || defined(CONFIG_NF_NAT_PPTP_MODULE)
 	struct nf_nat_pptp nat_pptp_info;
+#endif
 };
 
 struct nf_conn;