diff --git a/clang/include/clang/Sema/AnalysisBasedWarnings.h b/clang/include/clang/Sema/AnalysisBasedWarnings.h
index 020ddd36cf73e..aafe227b84084 100644
--- a/clang/include/clang/Sema/AnalysisBasedWarnings.h
+++ b/clang/include/clang/Sema/AnalysisBasedWarnings.h
@@ -34,9 +34,13 @@ class AnalysisBasedWarnings {
   class Policy {
     friend class AnalysisBasedWarnings;
     // The warnings to run.
+    LLVM_PREFERRED_TYPE(bool)
     unsigned enableCheckFallThrough : 1;
+    LLVM_PREFERRED_TYPE(bool)
     unsigned enableCheckUnreachable : 1;
+    LLVM_PREFERRED_TYPE(bool)
     unsigned enableThreadSafetyAnalysis : 1;
+    LLVM_PREFERRED_TYPE(bool)
     unsigned enableConsumedAnalysis : 1;
   public:
     Policy();