diff --git a/clang/include/clang/AST/Stmt.h b/clang/include/clang/AST/Stmt.h
--- a/clang/include/clang/AST/Stmt.h
+++ b/clang/include/clang/AST/Stmt.h
@@ -3587,8 +3587,11 @@
     llvm::PointerIntPair<VarDecl *, 2, VariableCaptureKind> VarAndKind;
     SourceLocation Loc;
 
+    Capture() = default;
+
   public:
     friend class ASTStmtReader;
+    friend class CapturedStmt;
 
     /// Create a new capture.
     ///
diff --git a/clang/lib/AST/Stmt.cpp b/clang/lib/AST/Stmt.cpp
--- a/clang/lib/AST/Stmt.cpp
+++ b/clang/lib/AST/Stmt.cpp
@@ -1345,6 +1345,11 @@
   : Stmt(CapturedStmtClass, Empty), NumCaptures(NumCaptures),
     CapDeclAndKind(nullptr, CR_Default) {
   getStoredStmts()[NumCaptures] = nullptr;
+
+  // Construct default capture objects.
+  Capture *Buffer = getStoredCaptures();
+  for (unsigned I = 0, N = NumCaptures; I != N; ++I)
+    new (Buffer++) Capture();
 }
 
 CapturedStmt *CapturedStmt::Create(const ASTContext &Context, Stmt *S,