diff --git a/device.h b/device.h
index 4ee9726..51f7094 100644
--- a/device.h
+++ b/device.h
@@ -23,7 +23,7 @@
 // Serial settings
 #define BAUD 9600
 #define SERIAL_DEBUG false
-#define TX_MAXWAIT 2UL
+#define TX_MAXWAIT 5UL
 
 // Port settings
 #if TARGET_CPU == m328p
diff --git a/protocol/LLP.h b/protocol/LLP.h
index e799036..6744ab2 100644
--- a/protocol/LLP.h
+++ b/protocol/LLP.h
@@ -9,7 +9,7 @@
 
 #define LLP_INTERLEAVE_SIZE 12
 #define LLP_MIN_FRAME_LENGTH LLP_INTERLEAVE_SIZE
-#define LLP_MAX_FRAME_LENGTH 67 * LLP_INTERLEAVE_SIZE
+#define LLP_MAX_FRAME_LENGTH 68 * LLP_INTERLEAVE_SIZE
 #define LLP_HEADER_SIZE 10
 #define LLP_CHECKSUM_SIZE 2
 #define LLP_MAX_DATA_SIZE LLP_MAX_FRAME_LENGTH - LLP_HEADER_SIZE - LLP_CHECKSUM_SIZE