diff --git a/soc/arm/st_stm32/stm32f3/dts_fixup.h b/soc/arm/st_stm32/stm32f3/dts_fixup.h
index 81cbe7a50c5..05fa39c4cf2 100644
--- a/soc/arm/st_stm32/stm32f3/dts_fixup.h
+++ b/soc/arm/st_stm32/stm32f3/dts_fixup.h
@@ -14,6 +14,12 @@
 #define CONFIG_UART_STM32_USART_2_NAME           ST_STM32_USART_40004400_LABEL
 #define USART_2_IRQ                              ST_STM32_USART_40004400_IRQ_0
 
+#define CONFIG_UART_STM32_USART_3_BASE_ADDRESS   ST_STM32_USART_40004800_BASE_ADDRESS
+#define CONFIG_UART_STM32_USART_3_BAUD_RATE      ST_STM32_USART_40004800_CURRENT_SPEED
+#define CONFIG_UART_STM32_USART_3_IRQ_PRI        ST_STM32_USART_40004800_IRQ_0_PRIORITY
+#define CONFIG_UART_STM32_USART_3_NAME           ST_STM32_USART_40004800_LABEL
+#define USART_3_IRQ                              ST_STM32_USART_40004800_IRQ_0
+
 #define CONFIG_I2C_1_BASE_ADDRESS               ST_STM32_I2C_V2_40005400_BASE_ADDRESS
 #define CONFIG_I2C_1_EVENT_IRQ_PRI              ST_STM32_I2C_V2_40005400_IRQ_EVENT_PRIORITY
 #define CONFIG_I2C_1_ERROR_IRQ_PRI              ST_STM32_I2C_V2_40005400_IRQ_ERROR_PRIORITY