diff --git a/stmhal/boards/STM32F429DISC/mpconfigboard.h b/stmhal/boards/STM32F429DISC/mpconfigboard.h
index e6c2fc9ef66833e6036bfc0fd574e4438b564b4a..f2cf6c1422fabf373e0657ae0ac211de49389dd0 100644
--- a/stmhal/boards/STM32F429DISC/mpconfigboard.h
+++ b/stmhal/boards/STM32F429DISC/mpconfigboard.h
@@ -29,8 +29,8 @@
 #define MICROPY_HW_UART2_PINS (GPIO_PIN_8 | GPIO_PIN_9)
 
 // I2C busses
-#define MICROPY_HW_I2C1_SCL (pin_A8)
-#define MICROPY_HW_I2C1_SDA (pin_C9)
+#define MICROPY_HW_I2C3_SCL (pin_A8)
+#define MICROPY_HW_I2C3_SDA (pin_C9)
 
 // SPI busses
 //#define MICROPY_HW_SPI1_NSS     (pin_A4)