diff --git a/ports/stm32/boards/NUCLEO_H743ZI/mpconfigboard.h b/ports/stm32/boards/NUCLEO_H743ZI/mpconfigboard.h
index 4fe41e0a1b..9642061371 100644
--- a/ports/stm32/boards/NUCLEO_H743ZI/mpconfigboard.h
+++ b/ports/stm32/boards/NUCLEO_H743ZI/mpconfigboard.h
@@ -27,10 +27,10 @@ void NUCLEO_H743ZI_board_early_init(void);
 #define MICROPY_HW_UART_REPL_BAUD   115200
 
 // I2C busses
-//#define MICROPY_HW_I2C1_SCL         (pin_B8)
-//#define MICROPY_HW_I2C1_SDA         (pin_B9)
-//#define MICROPY_HW_I2C3_SCL         (pin_H7)
-//#define MICROPY_HW_I2C3_SDA         (pin_H8)
+#define MICROPY_HW_I2C1_SCL         (pin_B8)
+#define MICROPY_HW_I2C1_SDA         (pin_B9)
+#define MICROPY_HW_I2C2_SCL         (pin_F1)
+#define MICROPY_HW_I2C2_SDA         (pin_F0)
 
 // SPI
 //#define MICROPY_HW_SPI2_NSS         (pin_I0)
diff --git a/ports/stm32/boards/NUCLEO_H743ZI/pins.csv b/ports/stm32/boards/NUCLEO_H743ZI/pins.csv
index b0d225368c..82f80764f7 100644
--- a/ports/stm32/boards/NUCLEO_H743ZI/pins.csv
+++ b/ports/stm32/boards/NUCLEO_H743ZI/pins.csv
@@ -30,8 +30,10 @@ TP3,PH15
 AUDIO_INT,PD6
 AUDIO_SDA,PH8
 AUDIO_SCL,PH7
-EXT_SDA,PB9
-EXT_SCL,PB8
+I2C1_SDA,PB9
+I2C1_SCL,PB8
+I2C2_SDA,PF0
+I2C2_SCL,PF1
 EXT_RST,PG3
 SD_D0,PG9
 SD_D1,PG10