diff --git a/clang/test/AST/Interp/switch.cpp b/clang/test/AST/Interp/switch.cpp
index 17cae3aadc35e..79b630f800748 100644
--- a/clang/test/AST/Interp/switch.cpp
+++ b/clang/test/AST/Interp/switch.cpp
@@ -1,5 +1,5 @@
-// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -verify %s
-// RUN: %clang_cc1 -verify=ref %s
+// RUN: %clang_cc1 -std=c++17 -fexperimental-new-constant-interpreter -verify %s
+// RUN: %clang_cc1 -std=c++17 -verify=ref %s
 
 constexpr bool isEven(int a) {
   bool v = false;