diff --git a/src/include/netif/ppp/ppp_impl.h b/src/include/netif/ppp/ppp_impl.h
index 8b1abed9..ddbc8934 100644
--- a/src/include/netif/ppp/ppp_impl.h
+++ b/src/include/netif/ppp/ppp_impl.h
@@ -87,12 +87,6 @@
 #define	PPP_ESCAPE	0x7d	/* Asynchronous Control Escape */
 #define	PPP_TRANS	0x20	/* Asynchronous transparency modifier */
 
-/*
- * Number of enabled low-level protocols
- * Useful for low-level protocols to check whether they are alone.
- */
-#define PPP_LINK_ENABLED_NUMBER (!!PPPOS_SUPPORT+!!PPPOE_SUPPORT+!!PPPOL2TP_SUPPORT)
-
 /*
  * Protocol field values.
  */