diff --git a/targets/TARGET_STM/TARGET_STM32U5/STM32Cube_FW/STM32U5xx_HAL_Driver/stm32u5xx_hal_gpio_ex.h b/targets/TARGET_STM/TARGET_STM32U5/STM32Cube_FW/STM32U5xx_HAL_Driver/stm32u5xx_hal_gpio_ex.h
index f6a02b2fac..7b84dc0fb0 100644
--- a/targets/TARGET_STM/TARGET_STM32U5/STM32Cube_FW/STM32U5xx_HAL_Driver/stm32u5xx_hal_gpio_ex.h
+++ b/targets/TARGET_STM/TARGET_STM32U5/STM32Cube_FW/STM32U5xx_HAL_Driver/stm32u5xx_hal_gpio_ex.h
@@ -105,6 +105,7 @@ typedef struct
 #define GPIO_AF3_TIM8          ((uint8_t)0x03)  /* TIM8 Alternate Function mapping  */
 #define GPIO_AF3_TIM8_COMP1    ((uint8_t)0x03)  /* TIM8/COMP1 Break in Alternate Function mapping  */
 #define GPIO_AF3_TIM8_COMP2    ((uint8_t)0x03)  /* TIM8/COMP2 Break in Alternate Function mapping  */
+#define GPIO_AF3_TIM1          ((uint8_t)0x03)  /* TIM1 Alternate Function mapping  */
 #define GPIO_AF3_TIM1_COMP1    ((uint8_t)0x03)  /* TIM1/COMP1 Break in Alternate Function mapping  */
 #define GPIO_AF3_TIM1_COMP2    ((uint8_t)0x03)  /* TIM1/COMP2 Break in Alternate Function mapping  */
 #define GPIO_AF3_USART2        ((uint8_t)0x03)  /* USART2 Alternate Function mapping  */