diff --git a/sys/net/if_ppp.h b/sys/net/if_ppp.h
index d3f01a7d72a9..b776c531e918 100644
--- a/sys/net/if_ppp.h
+++ b/sys/net/if_ppp.h
@@ -16,7 +16,7 @@
  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  *
- * $Id: if_ppp.h,v 1.10 1997/10/17 21:30:30 roberto Exp $
+ * $Id: if_ppp.h,v 1.11 1997/10/17 21:50:31 roberto Exp $
  */
 
 #ifndef _IF_PPP_H_
@@ -116,10 +116,10 @@ struct ifpppcstatsreq {
 #define PPPIOCGNPMODE	_IOWR('t', 76, struct npioctl) /* get NP mode */
 #define PPPIOCSNPMODE	_IOW('t', 75, struct npioctl)  /* set NP mode */
 #define PPPIOCGIDLE	_IOR('t', 74, struct ppp_idle) /* get idle time */
-#if NBPFILTER > 0
+#ifdef PPP_FILTER
 #define PPPIOCSPASS	_IOW('t', 71, struct bpf_program) /* set pass filter */
 #define PPPIOCSACTIVE	_IOW('t', 70, struct bpf_program) /* set active filt */
-#endif /* NBPFILTER */
+#endif /* PPP_FILTER */
 
 /* PPPIOC[GS]MTU are alternatives to SIOC[GS]IFMTU, used under Ultrix */
 #define PPPIOCGMTU	_IOR('t', 73, int)	/* get interface MTU */