diff --git a/ArmPlatformPkg/PrePi/PrePi.c b/ArmPlatformPkg/PrePi/PrePi.c
index 2bb1449581..74284f1883 100644
--- a/ArmPlatformPkg/PrePi/PrePi.c
+++ b/ArmPlatformPkg/PrePi/PrePi.c
@@ -22,7 +22,7 @@
 #include "PrePi.h"
 
 #define IS_XIP() (((UINT64)FixedPcdGet64 (PcdFdBaseAddress) > mSystemMemoryEnd) || \
-                  ((FixedPcdGet64 (PcdFdBaseAddress) + FixedPcdGet32 (PcdFdSize)) < FixedPcdGet64 (PcdSystemMemoryBase)))
+                  ((FixedPcdGet64 (PcdFdBaseAddress) + FixedPcdGet32 (PcdFdSize)) <= FixedPcdGet64 (PcdSystemMemoryBase)))
 
 UINT64 mSystemMemoryEnd = FixedPcdGet64(PcdSystemMemoryBase) +
                           FixedPcdGet64(PcdSystemMemorySize) - 1;