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]))
diff --git a/dump.c b/dump.c
index 289f161..dff3d5e 100644
--- a/dump.c
+++ b/dump.c
@@ -226,11 +226,11 @@
 
 /* generic hex dump */
 void logcat_hexdump(const char *info, const uint8_t *data, size_t len) {
-  char output[PACKETLEN * 3 + 2];
+  char output[MAXDUMPLEN * 3 + 2];
   size_t i;
 
   output[0] = '\0';
-  for (i = 0; i < len && i < PACKETLEN; i++) {
+  for (i = 0; i < len && i < MAXDUMPLEN; i++) {
     snprintf(output + i * 3, 4, " %02x", data[i]);
   }
   output[len * 3 + 3] = '\0';