diff --git a/board/yorp/board.c b/board/yorp/board.c
index df34cad66b..d5608a2be4 100644
--- a/board/yorp/board.c
+++ b/board/yorp/board.c
@@ -121,8 +121,8 @@ BUILD_ASSERT(ARRAY_SIZE(power_signal_list) == POWER_SIGNAL_COUNT);
 /* I2C port map. */
 const struct i2c_port_t i2c_ports[] = {
 	{"battery", I2C_PORT_BATTERY, 100, GPIO_I2C0_SCL, GPIO_I2C0_SDA},
-	{"tcpc0",   I2C_PORT_TCPC0,   400, GPIO_I2C1_SCL, GPIO_I2C1_SDA},
-	{"tcpc1",   I2C_PORT_TCPC1,   400, GPIO_I2C2_SCL, GPIO_I2C2_SDA},
+	{"tcpc0",   I2C_PORT_TCPC0,   100, GPIO_I2C1_SCL, GPIO_I2C1_SDA},
+	{"tcpc1",   I2C_PORT_TCPC1,   100, GPIO_I2C2_SCL, GPIO_I2C2_SDA},
 	{"eeprom",  I2C_PORT_EEPROM,  100, GPIO_I2C3_SCL, GPIO_I2C3_SDA},
 	{"charger", I2C_PORT_CHARGER, 100, GPIO_I2C4_SCL, GPIO_I2C4_SDA},
 	{"sensor",  I2C_PORT_SENSOR,  100, GPIO_I2C7_SCL, GPIO_I2C7_SDA},