--- a/pppd/sha1.c
+++ b/pppd/sha1.c
@@ -19,7 +19,7 @@
 #include <string.h>
 #include <time.h>
 #include <netinet/in.h>	/* htonl() */
-#include <net/ppp_defs.h>
+#include "pppd.h"
 #include "sha1.h"
 
 static void
