diff --git a/AX25Defines.h b/AX25Defines.h
index 03424b2..7087847 100644
--- a/AX25Defines.h
+++ b/AX25Defines.h
@@ -29,8 +29,8 @@ const uint8_t AX25_MAX_ONES    = 5U;
 
 const uint16_t AX25_MIN_FRAME_LENGTH = 17U;        // Callsign (7) + Callsign (7) + Control (1) + Checksum (2)
 
-const uint16_t AX25_MAX_FRAME_LENGTH = 294U;       // Callsign (7) + Callsign (7) + 3 Digipeaters (21) +
-                                                   // Control (1) + Data (256) + Checksum (2)
+const uint16_t AX25_MAX_FRAME_LENGTH = 330U;       // Callsign (7) + Callsign (7) + 8 Digipeaters (56) +
+                                                   // Control (1) + PID (1) + Data (256) + Checksum (2)
 
 #endif
 
diff --git a/AX25TX.h b/AX25TX.h
index e77c500..628e549 100644
--- a/AX25TX.h
+++ b/AX25TX.h
@@ -39,7 +39,7 @@ public:
 
 private:
   CAX25Twist m_twist;
-  uint8_t    m_poBuffer[560U];
+  uint8_t    m_poBuffer[600U];
   uint16_t   m_poLen;
   uint16_t   m_poPtr;
   uint16_t   m_txDelay;