diff --git a/arch/arm/soc/st_stm32/stm32f4/arm_mpu_mem_cfg.h b/arch/arm/soc/st_stm32/stm32f4/arm_mpu_mem_cfg.h
index 3173f7ad591..2469d7dba76 100644
--- a/arch/arm/soc/st_stm32/stm32f4/arm_mpu_mem_cfg.h
+++ b/arch/arm/soc/st_stm32/stm32f4/arm_mpu_mem_cfg.h
@@ -19,9 +19,9 @@
 #elif CONFIG_FLASH_SIZE == 512
 #define REGION_FLASH_SIZE REGION_512K
 #elif CONFIG_FLASH_SIZE == 1024
-#define REGION_FLASH_SIZE REGION_1024K
+#define REGION_FLASH_SIZE REGION_1M
 #elif CONFIG_FLASH_SIZE == 2048
-#define REGION_FLASH_SIZE REGION_2048K
+#define REGION_FLASH_SIZE REGION_2M
 #else
 #error "Unsupported configuration"
 #endif