diff --git a/drivers/pinmux/stm32/pinmux_stm32l4x.h b/drivers/pinmux/stm32/pinmux_stm32l4x.h
index ae4aa759a1c..56c195bbea3 100644
--- a/drivers/pinmux/stm32/pinmux_stm32l4x.h
+++ b/drivers/pinmux/stm32/pinmux_stm32l4x.h
@@ -105,6 +105,10 @@
 	(STM32_PINMUX_ALT_FUNC_7 | STM32_PUSHPULL_NOPULL)
 #define STM32L4X_PINMUX_FUNC_PD9_USART3_RX  \
 	(STM32_PINMUX_ALT_FUNC_7 | STM32_PUPDR_NO_PULL)
+#define STM32L4X_PINMUX_FUNC_PD12_I2C4_SCL  \
+	(STM32_PINMUX_ALT_FUNC_4 | STM32_OPENDRAIN_PULLUP)
+#define STM32L4X_PINMUX_FUNC_PD13_I2C4_SDA  \
+	(STM32_PINMUX_ALT_FUNC_4 | STM32_OPENDRAIN_PULLUP)
 
 /* Port F */
 #define STM32L4X_PINMUX_FUNC_PF1_I2C3_SCL   \