diff --git a/MdeModulePkg/Core/PiSmmCore/Pool.c b/MdeModulePkg/Core/PiSmmCore/Pool.c
index 96ebe811c6..e1ff40a8ea 100644
--- a/MdeModulePkg/Core/PiSmmCore/Pool.c
+++ b/MdeModulePkg/Core/PiSmmCore/Pool.c
@@ -382,11 +382,6 @@ SmmInternalFreePool (
     return EFI_INVALID_PARAMETER;
   }
 
-  MemoryGuarded = IsHeapGuardEnabled () &&
-                  IsMemoryGuarded ((EFI_PHYSICAL_ADDRESS)(UINTN)Buffer);
-  HasPoolTail = !(MemoryGuarded &&
-                  ((PcdGet8 (PcdHeapGuardPropertyMask) & BIT7) == 0));
-
   FreePoolHdr = (FREE_POOL_HEADER *)((POOL_HEADER *)Buffer - 1);
   ASSERT (FreePoolHdr->Header.Signature == POOL_HEAD_SIGNATURE);
   ASSERT (!FreePoolHdr->Header.Available);
@@ -394,6 +389,11 @@ SmmInternalFreePool (
     return EFI_INVALID_PARAMETER;
   }
 
+  MemoryGuarded = IsHeapGuardEnabled () &&
+                  IsMemoryGuarded ((EFI_PHYSICAL_ADDRESS)(UINTN)FreePoolHdr);
+  HasPoolTail = !(MemoryGuarded &&
+                  ((PcdGet8 (PcdHeapGuardPropertyMask) & BIT7) == 0));
+
   if (HasPoolTail) {
     PoolTail = HEAD_TO_TAIL (&FreePoolHdr->Header);
     ASSERT (PoolTail->Signature == POOL_TAIL_SIGNATURE);