diff --git a/board/grunt/board.c b/board/grunt/board.c
index a542c735de..600151e655 100644
--- a/board/grunt/board.c
+++ b/board/grunt/board.c
@@ -131,6 +131,7 @@ const struct i2c_port_t i2c_ports[] = {
 	{"tcpc0",   I2C_PORT_TCPC0,   400, GPIO_I2C1_SCL, GPIO_I2C1_SDA},
 	{"tcpc1",   I2C_PORT_TCPC1,   400, GPIO_I2C2_SCL, GPIO_I2C2_SDA},
 	{"thermal", I2C_PORT_THERMAL, 400, GPIO_I2C3_SCL, GPIO_I2C3_SDA},
+	{"kblight", I2C_PORT_KBLIGHT, 100, GPIO_I2C5_SCL, GPIO_I2C5_SDA},
 	{"sensor",  I2C_PORT_SENSOR,  400, GPIO_I2C7_SCL, GPIO_I2C7_SDA},
 };
 const unsigned int i2c_ports_used = ARRAY_SIZE(i2c_ports);
diff --git a/board/grunt/board.h b/board/grunt/board.h
index 36c52bbab7..973b9e76cd 100644
--- a/board/grunt/board.h
+++ b/board/grunt/board.h
@@ -114,6 +114,7 @@
 #define I2C_PORT_TCPC0		NPCX_I2C_PORT1_0
 #define I2C_PORT_TCPC1		NPCX_I2C_PORT2_0
 #define I2C_PORT_THERMAL	NPCX_I2C_PORT3_0
+#define I2C_PORT_KBLIGHT	NPCX_I2C_PORT5_0
 #define I2C_PORT_SENSOR		NPCX_I2C_PORT7_0
 /* Accelerometer and Gyroscope are the same device. */
 #define I2C_PORT_ACCEL		I2C_PORT_SENSOR