diff --git a/src/netif/ppp/pppd.h b/src/netif/ppp/pppd.h
index 3f30d29c..8056c74b 100644
--- a/src/netif/ppp/pppd.h
+++ b/src/netif/ppp/pppd.h
@@ -591,6 +591,7 @@ int  bad_ip_adrs __P((u_int32_t));
 				/* check if IP address is unreasonable */
 
 /* Procedures exported from demand.c */
+#if DEMAND_SUPPORT
 void demand_conf __P((void));	/* config interface(s) for demand-dial */
 void demand_block __P((void));	/* set all NPs to queue up packets */
 void demand_unblock __P((void)); /* set all NPs to pass packets */
@@ -598,6 +599,7 @@ void demand_discard __P((void)); /* set all NPs to discard packets */
 void demand_rexmit __P((int, u_int32_t)); /* retransmit saved frames for an NP*/
 int  loop_chars __P((unsigned char *, int)); /* process chars from loopback */
 int  loop_frame __P((unsigned char *, int)); /* should we bring link up? */
+#endif /* DEMAND_SUPPORT */
 
 /* Procedures exported from multilink.c */
 #ifdef HAVE_MULTILINK