diff --git a/src/netif/ppp/ppp_impl.h b/src/netif/ppp/ppp_impl.h
index fa6cf119..f40e4b6d 100644
--- a/src/netif/ppp/ppp_impl.h
+++ b/src/netif/ppp/ppp_impl.h
@@ -55,7 +55,6 @@
 /*
  * Limits.
  */
-#define NUM_PPP		1	/* One PPP interface supported (per process) */
 #define MAXWORDLEN	1024	/* max length of word in file (incl null) */
 #define MAXARGS		1	/* max # args to a command */
 #define MAXNAMELEN	256	/* max length of hostname or name for auth */