diff --git a/src/drivers/device/i2c_nuttx.cpp b/src/drivers/device/i2c_nuttx.cpp
index 88c40e5c48..7fbc4fc612 100644
--- a/src/drivers/device/i2c_nuttx.cpp
+++ b/src/drivers/device/i2c_nuttx.cpp
@@ -49,7 +49,7 @@ namespace device
  *  All calls to init() will NOT set the buss frequency
  */
 
-unsigned int I2C::_bus_clocks[3] = { 100000, 100000, 100000 };
+unsigned int I2C::_bus_clocks[BOARD_NUMBER_I2C_BUSES] = BOARD_I2C_BUS_CLOCK_INIT;
 
 I2C::I2C(const char *name,
 	 const char *devname,
diff --git a/src/drivers/device/i2c_nuttx.h b/src/drivers/device/i2c_nuttx.h
index f4aa608857..00e4848500 100644
--- a/src/drivers/device/i2c_nuttx.h
+++ b/src/drivers/device/i2c_nuttx.h
@@ -62,7 +62,7 @@ public:
 
 	static int	set_bus_clock(unsigned bus, unsigned clock_hz);
 
-	static unsigned	int	_bus_clocks[3];
+	static unsigned	int	_bus_clocks[BOARD_NUMBER_I2C_BUSES];
 
 protected:
 	/**