diff --git a/clang/lib/CodeGen/CGRecordLayout.h b/clang/lib/CodeGen/CGRecordLayout.h
index d5ea74922603b..6c06ad20fbe56 100644
--- a/clang/lib/CodeGen/CGRecordLayout.h
+++ b/clang/lib/CodeGen/CGRecordLayout.h
@@ -71,6 +71,7 @@ struct CGBitFieldInfo {
   unsigned Size : 15;
 
   /// Whether the bit-field is signed.
+  LLVM_PREFERRED_TYPE(bool)
   unsigned IsSigned : 1;
 
   /// The storage size in bits which should be used when accessing this