diff --git a/soc/arm/st_stm32/stm32f3/dts_fixup.h b/soc/arm/st_stm32/stm32f3/dts_fixup.h
index 05fa39c4cf2..566db28378d 100644
--- a/soc/arm/st_stm32/stm32f3/dts_fixup.h
+++ b/soc/arm/st_stm32/stm32f3/dts_fixup.h
@@ -36,6 +36,14 @@
 #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_40007800_BASE_ADDRESS
+#define CONFIG_I2C_3_EVENT_IRQ_PRI              ST_STM32_I2C_V2_40007800_IRQ_EVENT_PRIORITY
+#define CONFIG_I2C_3_ERROR_IRQ_PRI              ST_STM32_I2C_V2_40007800_IRQ_ERROR_PRIORITY
+#define CONFIG_I2C_3_NAME                       ST_STM32_I2C_V2_40007800_LABEL
+#define CONFIG_I2C_3_EVENT_IRQ                  ST_STM32_I2C_V2_40007800_IRQ_EVENT
+#define CONFIG_I2C_3_ERROR_IRQ                  ST_STM32_I2C_V2_40007800_IRQ_ERROR
+#define CONFIG_I2C_3_BITRATE                    ST_STM32_I2C_V2_40007800_CLOCK_FREQUENCY
+
 #define CONFIG_SPI_1_BASE_ADDRESS		ST_STM32_SPI_FIFO_40013000_BASE_ADDRESS
 #define CONFIG_SPI_1_IRQ_PRI			ST_STM32_SPI_FIFO_40013000_IRQ_0_PRIORITY
 #define CONFIG_SPI_1_NAME			ST_STM32_SPI_FIFO_40013000_LABEL