diff --git a/include/zephyr/arch/arm/mpu/arm_mpu_mem_cfg.h b/include/zephyr/arch/arm/mpu/arm_mpu_mem_cfg.h
index 5b52a939d2a77..a99223262d64a 100644
--- a/include/zephyr/arch/arm/mpu/arm_mpu_mem_cfg.h
+++ b/include/zephyr/arch/arm/mpu/arm_mpu_mem_cfg.h
@@ -12,7 +12,9 @@
 #if !defined(CONFIG_ARMV8_M_BASELINE) && !defined(CONFIG_ARMV8_M_MAINLINE)
 
 /* Flash Region Definitions */
-#if CONFIG_FLASH_SIZE <= 64
+#if CONFIG_FLASH_SIZE <= 32
+#define REGION_FLASH_SIZE REGION_32K
+#elif CONFIG_FLASH_SIZE <= 64
 #define REGION_FLASH_SIZE REGION_64K
 #elif CONFIG_FLASH_SIZE <= 128
 #define REGION_FLASH_SIZE REGION_128K
@@ -30,6 +32,8 @@
 #define REGION_FLASH_SIZE REGION_8M
 #elif CONFIG_FLASH_SIZE <= 16384
 #define REGION_FLASH_SIZE REGION_16M
+#elif CONFIG_FLASH_SIZE <= 32768
+#define REGION_FLASH_SIZE REGION_32M
 #elif CONFIG_FLASH_SIZE <= 65536
 #define REGION_FLASH_SIZE REGION_64M
 #elif CONFIG_FLASH_SIZE <= 131072