diff --git a/MdePkg/Include/Base.h b/MdePkg/Include/Base.h
index b7b6569787..734886fbe7 100644
--- a/MdePkg/Include/Base.h
+++ b/MdePkg/Include/Base.h
@@ -70,7 +70,7 @@ struct _LIST_ENTRY {
 #define STATIC    static
 
 ///
-/// Undclared type
+/// Undeclared type
 ///
 #define VOID      void