1 files changed, 3 insertions, 2 deletions
diff --git a/include/clang/AST/UnresolvedSet.h b/include/clang/AST/UnresolvedSet.h
index c1be2aa0f201..b63c6eb21769 100644
--- a/include/clang/AST/UnresolvedSet.h
+++ b/include/clang/AST/UnresolvedSet.h
@@ -17,7 +17,6 @@
 
 #include "clang/AST/DeclAccessPair.h"
 #include "clang/Basic/LLVM.h"
-#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/iterator.h"
 
@@ -39,7 +38,9 @@ class UnresolvedSetIterator : public llvm::iterator_adaptor_base<
       : iterator_adaptor_base(const_cast<DeclAccessPair *>(Iter)) {}
 
 public:
-  UnresolvedSetIterator() {}
+  // Work around a bug in MSVC 2013 where explicitly default constructed
+  // temporaries with defaulted ctors are not zero initialized.
+  UnresolvedSetIterator() : iterator_adaptor_base(nullptr) {}
 
   NamedDecl *getDecl() const { return I->getDecl(); }
   void setDecl(NamedDecl *ND) const { return I->setDecl(ND); }