diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index de3cddf66c..03ba548de2 100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -40,16 +40,18 @@ typedef struct {
 } ARM_CACHE_INFO;
 
 typedef enum {
-  ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED,
-  ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK,
-  ARM_MEMORY_REGION_ATTRIBUTE_WRITE_THROUGH,
-  ARM_MEMORY_REGION_ATTRIBUTE_DEVICE,
+  ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED = 0,
   ARM_MEMORY_REGION_ATTRIBUTE_SECURE_UNCACHED_UNBUFFERED,
+  ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK,
   ARM_MEMORY_REGION_ATTRIBUTE_SECURE_WRITE_BACK,
+  ARM_MEMORY_REGION_ATTRIBUTE_WRITE_THROUGH,
   ARM_MEMORY_REGION_ATTRIBUTE_SECURE_WRITE_THROUGH,
+  ARM_MEMORY_REGION_ATTRIBUTE_DEVICE,
   ARM_MEMORY_REGION_ATTRIBUTE_SECURE_DEVICE
 } ARM_MEMORY_REGION_ATTRIBUTES;
 
+#define IS_ARM_MEMORY_REGION_ATTRIBUTES_SECURE(attr) ((UINT32)(attr) & 1)
+
 typedef struct {
   UINT32                        PhysicalBase;
   UINT32                        VirtualBase;