--- linux-2.6.24-rc5/net/rose/af_rose.c	2007-12-11 04:48:43.000000000 +0100
+++ b/net/rose/af_rose.c	2007-12-14 14:35:16.000000000 +0100
@@ -1148,7 +1148,7 @@
 	}
 
 #ifdef M_BIT
-#define ROSE_PACLEN (256-ROSE_MIN_LEN)
+#define ROSE_PACLEN (AX25_DEF_PACLEN-ROSE_MIN_LEN)
 	if (skb->len - ROSE_MIN_LEN > ROSE_PACLEN) {
 		unsigned char header[ROSE_MIN_LEN];
 		struct sk_buff *skbn;