diff --git a/clang/lib/AST/Linkage.h b/clang/lib/AST/Linkage.h
index 31f384eb75d0b..e4dcb5e53261c 100644
--- a/clang/lib/AST/Linkage.h
+++ b/clang/lib/AST/Linkage.h
@@ -29,12 +29,15 @@ namespace clang {
 struct LVComputationKind {
   /// The kind of entity whose visibility is ultimately being computed;
   /// visibility computations for types and non-types follow different rules.
+  LLVM_PREFERRED_TYPE(bool)
   unsigned ExplicitKind : 1;
   /// Whether explicit visibility attributes should be ignored. When set,
   /// visibility may only be restricted by the visibility of template arguments.
+  LLVM_PREFERRED_TYPE(bool)
   unsigned IgnoreExplicitVisibility : 1;
   /// Whether all visibility should be ignored. When set, we're only interested
   /// in computing linkage.
+  LLVM_PREFERRED_TYPE(bool)
   unsigned IgnoreAllVisibility : 1;
 
   enum { NumLVComputationKindBits = 3 };