diff --git a/clang/lib/Tooling/Syntax/BuildTree.cpp b/clang/lib/Tooling/Syntax/BuildTree.cpp
--- a/clang/lib/Tooling/Syntax/BuildTree.cpp
+++ b/clang/lib/Tooling/Syntax/BuildTree.cpp
@@ -1123,7 +1123,7 @@
   syntax::CallArguments *
   buildCallArguments(CallExpr::arg_range ArgsAndDefaultArgs) {
     auto Args = dropDefaultArgs(ArgsAndDefaultArgs);
-    for (const auto &Arg : Args) {
+    for (auto *Arg : Args) {
       Builder.markExprChild(Arg, syntax::NodeRole::ListElement);
       const auto *DelimiterToken =
           std::next(Builder.findToken(Arg->getEndLoc()));