diff --git a/include/mpark/variant.hpp b/include/mpark/variant.hpp
index fb2cf06..6debb99 100644
--- a/include/mpark/variant.hpp
+++ b/include/mpark/variant.hpp
@@ -243,7 +243,7 @@ namespace std {
 #endif
 
 #if defined(__cpp_constexpr) && __cpp_constexpr >= 201304
-#define MPARK_CPP14_CONSTEXPR
+//#define MPARK_CPP14_CONSTEXPR
 #endif
 
 #if __has_feature(cxx_exceptions) || defined(__cpp_exceptions) || \