diff --git a/sys/i386/include/i4b_isppp.h b/sys/i386/include/i4b_isppp.h
index 9d1b59e3552..8855b3785f0 100644
--- a/sys/i386/include/i4b_isppp.h
+++ b/sys/i386/include/i4b_isppp.h
@@ -75,7 +75,7 @@ struct sipcp {
 	int	compress_cid;	/* Comp-Slot-Id */
 };
 
-#define AUTHNAMELEN	32
+#define AUTHNAMELEN	42
 #define AUTHKEYLEN	16
 
 struct sauth {