diff -up ppp-2.4.5/pppd/utils.c.lock ppp-2.4.5/pppd/utils.c
--- ppp-2.4.5/pppd/utils.c.lock	2011-05-30 15:30:36.432371849 +0200
+++ ppp-2.4.5/pppd/utils.c	2011-05-30 15:30:48.575495854 +0200
@@ -859,7 +859,7 @@ complete_read(int fd, void *buf, size_t 
 /* Procedures for locking the serial device using a lock file. */
 #ifndef LOCK_DIR
 #ifdef __linux__
-#define LOCK_DIR	"/var/lock"
+#define LOCK_DIR	"/var/lock/ppp"
 #else
 #ifdef SVR4
 #define LOCK_DIR	"/var/spool/locks"