diff --git a/include/llvm/CodeGen/ValueTypes.h b/include/llvm/CodeGen/ValueTypes.h
index 3767c1930b7..e6d1f49591a 100644
--- a/include/llvm/CodeGen/ValueTypes.h
+++ b/include/llvm/CodeGen/ValueTypes.h
@@ -26,7 +26,8 @@ namespace llvm {
   class LLVMContext;
   struct EVT;
 
-  struct MVT { // MVT = Machine Value Type
+  class MVT { // MVT = Machine Value Type
+  public:
     enum SimpleValueType {
       // If you change this numbering, you must change the values in
       // ValueTypes.td as well!