diff --git a/clang/test/SemaCXX/constexpr-default-init-value-crash.cpp b/clang/test/SemaCXX/constexpr-default-init-value-crash.cpp
index 03957cee510f2..766ca0fee00de 100644
--- a/clang/test/SemaCXX/constexpr-default-init-value-crash.cpp
+++ b/clang/test/SemaCXX/constexpr-default-init-value-crash.cpp
@@ -1,5 +1,8 @@
 // RUN: %clang_cc1 %s -std=c++20 -fsyntax-only -verify
 // RUN: %clang_cc1 %s -std=c++20 -fsyntax-only -verify -fno-recovery-ast
+// RUN: %clang_cc1 %s -std=c++20 -fsyntax-only -verify -fexperimental-new-constant-interpreter
+// RUN: %clang_cc1 %s -std=c++20 -fsyntax-only -verify -fno-recovery-ast -fexperimental-new-constant-interpreter
+
 
 namespace NoCrash {
 struct ForwardDecl; // expected-note {{forward declaration of}}
diff --git a/clang/test/SemaCXX/constexpr-turing.cpp b/clang/test/SemaCXX/constexpr-turing.cpp
index 75aefbf2ab7aa..094079b8b61ab 100644
--- a/clang/test/SemaCXX/constexpr-turing.cpp
+++ b/clang/test/SemaCXX/constexpr-turing.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -verify -std=c++11 %s
+// RUN: %clang_cc1 -verify -std=c++11 %s -fexperimental-new-constant-interpreter
 // expected-no-diagnostics
 
 // A direct proof that constexpr is Turing-complete, once DR1454 is implemented.