diff --git a/src/target/stm32h5.c b/src/target/stm32h5.c
index b3728c67c40..b49d8c811cc 100644
--- a/src/target/stm32h5.c
+++ b/src/target/stm32h5.c
@@ -98,7 +98,11 @@
 #define STM32H5_FLASH_BANK_MASK         0x80000000U
 #define STM32H5_FLASH_SECTOR_COUNT_MASK 0x000000ffU
 
-#define STM32H5_DBGMCU_BASE        0xe0044000
+/*
+ * Both on H56x and H503 DBGMCU is visible via AP0 on Debug APB at 0xe0044000,
+ * and via AP1 by the processor at 0x44024000 alias.
+ */
+#define STM32H5_DBGMCU_BASE        0x44024000
 #define STM32H5_DBGMCU_IDCODE      (STM32H5_DBGMCU_BASE + 0x00U)
 #define STM32H5_DBGMCU_CONFIG      (STM32H5_DBGMCU_BASE + 0x04U)
 #define STM32H5_DBGMCU_APB1LFREEZE (STM32H5_DBGMCU_BASE + 0x08U)