diff --git a/arch/arm/soc/st_stm32/stm32l4/dts.fixup b/arch/arm/soc/st_stm32/stm32l4/dts.fixup
index 426875190ce..20860f1e836 100644
--- a/arch/arm/soc/st_stm32/stm32l4/dts.fixup
+++ b/arch/arm/soc/st_stm32/stm32l4/dts.fixup
@@ -54,6 +54,14 @@
 #define CONFIG_I2C_2_ERROR_IRQ                  ST_STM32_I2C_V2_40005800_IRQ_ERROR
 #define CONFIG_I2C_2_BITRATE                    ST_STM32_I2C_V2_40005800_CLOCK_FREQUENCY
 
+#define CONFIG_I2C_3_BASE_ADDRESS               ST_STM32_I2C_V2_40005C00_BASE_ADDRESS
+#define CONFIG_I2C_3_EVENT_IRQ_PRI              ST_STM32_I2C_V2_40005C00_IRQ_EVENT_PRIORITY
+#define CONFIG_I2C_3_ERROR_IRQ_PRI              ST_STM32_I2C_V2_40005C00_IRQ_ERROR_PRIORITY
+#define CONFIG_I2C_3_NAME                       ST_STM32_I2C_V2_40005C00_LABEL
+#define CONFIG_I2C_3_EVENT_IRQ                  ST_STM32_I2C_V2_40005C00_IRQ_EVENT
+#define CONFIG_I2C_3_ERROR_IRQ                  ST_STM32_I2C_V2_40005C00_IRQ_ERROR
+#define CONFIG_I2C_3_BITRATE                    ST_STM32_I2C_V2_40005C00_CLOCK_FREQUENCY
+
 #define CONFIG_I2C_4_BASE_ADDRESS               ST_STM32_I2C_V2_40008400_BASE_ADDRESS
 #define CONFIG_I2C_4_EVENT_IRQ_PRI              ST_STM32_I2C_V2_40008400_IRQ_EVENT_PRIORITY
 #define CONFIG_I2C_4_ERROR_IRQ_PRI              ST_STM32_I2C_V2_40008400_IRQ_ERROR_PRIORITY