diff --git a/clang/test/SemaCXX/constexpr-ackermann.cpp b/clang/test/SemaCXX/constexpr-ackermann.cpp
index c4ea3139483df..9d368adc8f7a2 100644
--- a/clang/test/SemaCXX/constexpr-ackermann.cpp
+++ b/clang/test/SemaCXX/constexpr-ackermann.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -std=c++11 -fsyntax-only %s
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -fexperimental-new-constant-interpreter %s
 
 constexpr unsigned long long A(unsigned long long m, unsigned long long n) {
   return m == 0 ? n + 1 : n == 0 ? A(m-1, 1) : A(m - 1, A(m, n - 1));
diff --git a/clang/test/SemaCXX/constexpr-default-arg.cpp b/clang/test/SemaCXX/constexpr-default-arg.cpp
index 0cef4aa578af3..f5771bd441f9e 100644
--- a/clang/test/SemaCXX/constexpr-default-arg.cpp
+++ b/clang/test/SemaCXX/constexpr-default-arg.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -std=c++1y -S -o - -emit-llvm -verify %s
+// RUN: %clang_cc1 -std=c++1y -fexperimental-new-constant-interpreter -S -o - -emit-llvm -verify %s
 
 namespace default_arg_temporary {
 
diff --git a/clang/test/SemaCXX/constexpr-late-instantiation.cpp b/clang/test/SemaCXX/constexpr-late-instantiation.cpp
index ec8e071217c1d..9aec0c90e61dc 100644
--- a/clang/test/SemaCXX/constexpr-late-instantiation.cpp
+++ b/clang/test/SemaCXX/constexpr-late-instantiation.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 %s -fsyntax-only -verify
+// RUN: %clang_cc1 %s -fexperimental-new-constant-interpreter -fsyntax-only -verify
 
 template <typename T>
 constexpr T foo(T a);   // expected-note {{declared here}}
diff --git a/clang/test/SemaCXX/constexpr-nqueens.cpp b/clang/test/SemaCXX/constexpr-nqueens.cpp
index 47133a2934340..b28397bfb2191 100644
--- a/clang/test/SemaCXX/constexpr-nqueens.cpp
+++ b/clang/test/SemaCXX/constexpr-nqueens.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -std=c++11 -fsyntax-only %s
+// RUN: %clang_cc1 -std=c++11 -fsyntax-only -fexperimental-new-constant-interpreter %s
 
 typedef unsigned long uint64_t;
 
diff --git a/clang/test/SemaCXX/constexpr-unsigned-high-bit.cpp b/clang/test/SemaCXX/constexpr-unsigned-high-bit.cpp
index 19d8dcab66073..d85e645509d8e 100644
--- a/clang/test/SemaCXX/constexpr-unsigned-high-bit.cpp
+++ b/clang/test/SemaCXX/constexpr-unsigned-high-bit.cpp
@@ -1,4 +1,5 @@
 // RUN: %clang_cc1 -std=c++14 -fsyntax-only %s
+// RUN: %clang_cc1 -std=c++14 -fsyntax-only -fexperimental-new-constant-interpreter %s
 
 #include <limits.h>