1 files changed, 6 insertions, 1 deletions
diff --git a/clang/lib/AST/StmtPrinter.cpp b/clang/lib/AST/StmtPrinter.cpp
index 9c7259745ca..5bd61c3b529 100644
--- a/clang/lib/AST/StmtPrinter.cpp
+++ b/clang/lib/AST/StmtPrinter.cpp
@@ -814,7 +814,12 @@ void StmtPrinter::VisitUnaryExprOrTypeTraitExpr(UnaryExprOrTypeTraitExpr *Node){
     OS << "sizeof";
     break;
   case UETT_AlignOf:
-    OS << "__alignof";
+    if (Policy.LangOpts.CPlusPlus)
+      OS << "alignof";
+    else if (Policy.LangOpts.C11)
+      OS << "_Alignof";
+    else
+      OS << "__alignof";
     break;
   case UETT_VecStep:
     OS << "vec_step";