diff --git a/MdePkg/Library/BaseLib/Unaligned.c b/MdePkg/Library/BaseLib/Unaligned.c
index a54a99e7e6..2ce8fc6992 100644
--- a/MdePkg/Library/BaseLib/Unaligned.c
+++ b/MdePkg/Library/BaseLib/Unaligned.c
@@ -113,7 +113,8 @@ WriteUnaligned24 (
 {
   ASSERT (Buffer != NULL);
 
-  return *Buffer = BitFieldWrite32 (*Buffer, 0, 23, Value);
+  BitFieldWrite32 (*Buffer, 0, 23, Value);
+  return Value;
 }
 
 /**