diff --git a/lib/lib_i2c/mlx90640-library/MLX90640_API.cpp b/lib/lib_i2c/mlx90640-library/MLX90640_API.cpp
index 8b1822bf4..f2a8731c3 100644
--- a/lib/lib_i2c/mlx90640-library/MLX90640_API.cpp
+++ b/lib/lib_i2c/mlx90640-library/MLX90640_API.cpp
@@ -42,7 +42,9 @@ int MLX90640_I2CRead(uint8_t addr, uint32_t reg, uint16_t len, uint16_t *reg_dat
 int MLX90640_I2CWrite(uint8_t _deviceAddress, unsigned int writeAddress, uint16_t data);
 
 // I2C
-#define I2C_BUFFER_LENGTH 128
+#ifndef I2C_BUFFER_LENGTH
+  #define I2C_BUFFER_LENGTH 128
+#endif
 
 int MLX90640_I2CRead(uint8_t addr, uint32_t reg, uint16_t len, uint16_t *reg_data){
   int bytesRemaining = len * 2;