diff --git a/boards/arm/stm32l4/nucleo-l432kc/include/board.h b/boards/arm/stm32l4/nucleo-l432kc/include/board.h
index 8d79a89c0c7..e7ae5a88a00 100644
--- a/boards/arm/stm32l4/nucleo-l432kc/include/board.h
+++ b/boards/arm/stm32l4/nucleo-l432kc/include/board.h
@@ -148,6 +148,11 @@
    (GPIO_OUTPUT | GPIO_OPENDRAIN | GPIO_SPEED_50MHz | GPIO_OUTPUT_SET | \
     GPIO_PORTB | GPIO_PIN7)
 
+#define GPIO_I2C3_SCL \
+   (GPIO_I2C3_SCL_1 | GPIO_OPENDRAIN | GPIO_SPEED_50MHz | GPIO_OUTPUT_SET)
+#define GPIO_I2C3_SDA \
+   (GPIO_I2C3_SDA_1 | GPIO_OPENDRAIN | GPIO_SPEED_50MHz | GPIO_OUTPUT_SET)
+
 /* SPI */
 
 #if 1