diff --git a/clatd.h b/clatd.h
index e810a3b..4be071c 100644
--- a/clatd.h
+++ b/clatd.h
@@ -43,6 +43,10 @@
 // ie. if we ever read >= MAXMTU bytes we should discard.
 #define MAXMTU (0xFFFF + 28 + 1)
 #define PACKETLEN (sizeof(struct tun_pi) + MAXMTU)
+
+// logcat_hexdump() maximum binary data length
+#define MAXDUMPLEN PACKETLEN
+
 #define CLATD_VERSION "1.5"
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))