diff --git a/left/src/init_peripherals.c b/left/src/init_peripherals.c
index 2545273..c7f2e68 100644
--- a/left/src/init_peripherals.c
+++ b/left/src/init_peripherals.c
@@ -27,7 +27,7 @@ static void i2cSlaveCallback(I2C_Type *base, i2c_slave_transfer_t *xfer, void *u
                 ((uint8_t*)&RxMessage)[rxMessagePos++] = byteIn;
             } else {
                 rxMessagePos = 0;
-                memset(&RxMessage, 0, I2C_BUFFER_MAX_LENGTH);
+                memset(&RxMessage, 0, I2C_MESSAGE_MAX_TOTAL_LENGTH);
             }
 
             xfer->data = (uint8_t*)&byteIn;
diff --git a/shared/slave_protocol.h b/shared/slave_protocol.h
index 44b98b7..fcf568b 100644
--- a/shared/slave_protocol.h
+++ b/shared/slave_protocol.h
@@ -5,7 +5,7 @@
 
     #define I2C_MESSAGE_HEADER_LENGTH 3
     #define I2C_MESSAGE_MAX_PAYLOAD_LENGTH 255
-    #define I2C_BUFFER_MAX_LENGTH (I2C_MESSAGE_HEADER_LENGTH + I2C_MESSAGE_MAX_PAYLOAD_LENGTH)
+    #define I2C_MESSAGE_MAX_TOTAL_LENGTH (I2C_MESSAGE_HEADER_LENGTH + I2C_MESSAGE_MAX_PAYLOAD_LENGTH)
 
 // Typedefs: