diff --git a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
index feba9fdd6d..ea9f5071ea 100644
--- a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
+++ b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
@@ -16,6 +16,7 @@
 #include <Base.h>
 
 
+#include <Library/BaseLib.h>
 #include <Library/UefiDecompressLib.h>
 #include <Library/DebugLib.h>
 #include <Library/BaseMemoryLib.h>
@@ -689,19 +690,18 @@ UefiDecompressGetInfo (
   ASSERT (DestinationSize != NULL);
   ASSERT (ScratchSize != NULL);
 
-  *ScratchSize  = sizeof (SCRATCH_DATA);
-
   if (SourceSize < 8) {
     return RETURN_INVALID_PARAMETER;
   }
 
-  CopyMem (&CompressedSize, Source, sizeof (UINT32));
-  CopyMem (DestinationSize, (VOID *)((UINT8 *)Source + 4), sizeof (UINT32));
-
+  CompressedSize   = ReadUnaligned32 ((UINT32 *)Source);
   if (SourceSize < (CompressedSize + 8)) {
     return RETURN_INVALID_PARAMETER;
   }
 
+  *ScratchSize  = sizeof (SCRATCH_DATA);
+  *DestinationSize = ReadUnaligned32 ((UINT32 *)Source + 1);
+
   return RETURN_SUCCESS;
 }
 
diff --git a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.inf b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.inf
index f017d24454..3e7305095b 100644
--- a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.inf
+++ b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.inf
@@ -39,6 +39,7 @@
 
 
 [LibraryClasses]
+  BaseLib
   BaseMemoryLib
   DebugLib