diff --git a/src/include/netif/ppp/ppp_impl.h b/src/include/netif/ppp/ppp_impl.h
index 7d959dba..caf499aa 100644
--- a/src/include/netif/ppp/ppp_impl.h
+++ b/src/include/netif/ppp/ppp_impl.h
@@ -63,14 +63,6 @@
 #define PPP_CTRL_PBUF_MAX_SIZE   PBUF_POOL_BUFSIZE
 #endif /* PPP_USE_PBUF_RAM */
 
-/*
- * Limits.
- */
-#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 */
-#define MAXSECRETLEN	256	/* max length of password or secret */
-
 /*
  * The basic PPP frame.
  */
diff --git a/src/netif/ppp/eap.c b/src/netif/ppp/eap.c
index f0852f97..4b188cb9 100644
--- a/src/netif/ppp/eap.c
+++ b/src/netif/ppp/eap.c
@@ -431,7 +431,7 @@ u_char *outp;
  */
 static void eap_figure_next_state(ppp_pcb *pcb, int status) {
 #ifdef USE_SRP
-	unsigned char secbuf[MAXWORDLEN], clear[8], *sp, *dp;
+	unsigned char secbuf[MAXSECRETLEN], clear[8], *sp, *dp;
 	struct t_pw tpw;
 	struct t_confent *tce, mytce;
 	char *cp, *cp2;
@@ -1331,7 +1331,7 @@ static void eap_request(ppp_pcb *pcb, u_char *inp, int id, int len) {
 	u_char typenum;
 	u_char vallen;
 	int secret_len;
-	char secret[MAXWORDLEN];
+	char secret[MAXSECRETLEN];
 	char rhostname[MAXNAMELEN];
 	md5_context mdContext;
 	u_char hash[MD5_SIGNATURE_SIZE];