diff --git a/Libraries/PeriphDrivers/Include/MAX78000/i2c.h b/Libraries/PeriphDrivers/Include/MAX78000/i2c.h
index 7ccb00b22f0..5f878f9e7d4 100644
--- a/Libraries/PeriphDrivers/Include/MAX78000/i2c.h
+++ b/Libraries/PeriphDrivers/Include/MAX78000/i2c.h
@@ -43,6 +43,12 @@ extern "C" {
  * @{
  */
 
+/***** Definitions *****/
+#define MXC_I2C_STD_MODE 100000
+#define MXC_I2C_FAST_SPEED 400000
+#define MXC_I2C_FASTPLUS_SPEED 1000000
+#define MXC_I2C_HIGH_SPEED 3400000
+
 typedef struct _i2c_req_t mxc_i2c_req_t;
 /**
  * @brief   The callback used by the MXC_I2C_ReadByteInteractive() function.