diff --git a/apps/old_ABI.c b/apps/old_ABI.c
index 3604e58..052fed7 100644
--- a/apps/old_ABI.c
+++ b/apps/old_ABI.c
@@ -3,6 +3,10 @@
 #include <efi.h>
 #include <efilib.h>
 
+/* EFI_TIMESTAMP_PROTOCOL */
+#define TEST_GUID { 0xafbfde41, 0x2e6e, 0x4262,\
+  { 0xba, 0x65, 0x62, 0xb9, 0x23, 0x6e, 0x54, 0x95 }}
+
 EFI_STATUS
 efi_main (EFI_HANDLE image EFI_UNUSED, EFI_SYSTEM_TABLE *systab EFI_UNUSED)
 {
@@ -16,6 +20,14 @@ efi_main (EFI_HANDLE image EFI_UNUSED, EFI_SYSTEM_TABLE *systab EFI_UNUSED)
     Dest = AllocatePool(test_str_size);
     CopyMem(Dest, test_str, test_str_size);
     Copy = ReallocatePool(Dest, test_str_size, test_str_size+10);
-    Print(u"Done!\r\n");
+    Print(u"Done CopyMem and ReallocatePool!\r\n");
+
+    EFI_GUID a = TEST_GUID;
+    EFI_GUID b = TEST_GUID;
+    if (CompareGuid(&a, &b) == 0) {
+        Print(u"CompareGuid ok!\r\n");
+    } else {
+        Print(u"CompareGuid fail!\r\n");
+    }
     return EFI_SUCCESS;
 }