diff --git a/MdePkg/Include/Library/UefiLib.h b/MdePkg/Include/Library/UefiLib.h
index 1d8a8e1166..b6750e4f8a 100644
--- a/MdePkg/Include/Library/UefiLib.h
+++ b/MdePkg/Include/Library/UefiLib.h
@@ -98,7 +98,7 @@ typedef struct {
   Macro that returns the a pointer to the next EFI_MEMORY_DESCRIPTOR in an array 
   returned from GetMemoryMap().  
 
-  @param  MemoryDescriptor  Pointer tot he current EFI_MEMORY_DESCRIPTOR.
+  @param  MemoryDescriptor  A pointer to an EFI_MEMORY_DESCRIPTOR.
 
   @param  Size              The size, in bytes, of the current EFI_MEMORY_DESCRIPTOR.
 
diff --git a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
index 98492c88f8..21d35e29da 100644
--- a/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
+++ b/MdePkg/Library/BaseUefiDecompressLib/BaseUefiDecompressLib.c
@@ -604,7 +604,7 @@ Decode (
       //
       // Process a Pointer
       //
-      CharC       = (UINT16) (CharC - (UINT8_MAX + 1 - THRESHOLD));
+      CharC       = (UINT16) (CharC - (BIT8 - THRESHOLD));
  
       //
       // Get string length