diff --git a/board/ryu/board.c b/board/ryu/board.c
index fd76388d1d..0e3c5af423 100644
--- a/board/ryu/board.c
+++ b/board/ryu/board.c
@@ -268,7 +268,7 @@ BUILD_ASSERT(ARRAY_SIZE(adc_channels) == ADC_CH_COUNT);
 const struct i2c_port_t i2c_ports[] = {
 	{"master", I2C_PORT_MASTER, 100,
 		GPIO_MASTER_I2C_SCL, GPIO_MASTER_I2C_SDA},
-	{"slave",  I2C_PORT_SLAVE, 100,
+	{"slave",  I2C_PORT_SLAVE, 1000,
 		GPIO_SLAVE_I2C_SCL, GPIO_SLAVE_I2C_SDA},
 };
 const unsigned int i2c_ports_used = ARRAY_SIZE(i2c_ports);
diff --git a/chip/stm32/i2c-stm32f0.c b/chip/stm32/i2c-stm32f0.c
index dc9d295ae0..4d2da2a353 100644
--- a/chip/stm32/i2c-stm32f0.c
+++ b/chip/stm32/i2c-stm32f0.c
@@ -78,7 +78,7 @@ static void i2c_set_freq_port(const struct i2c_port_t *p)
 	/* Set clock frequency */
 	switch (p->kbps) {
 	case 1000:
-		STM32_I2C_TIMINGR(port) = 0x50110103;
+		STM32_I2C_TIMINGR(port) = 0x50100103;
 		break;
 	case 400:
 		STM32_I2C_TIMINGR(port) = 0x50330309;