diff --git a/include/nlohmann/json.hpp b/include/nlohmann/json.hpp
index d7280752..85868f63 100644
--- a/include/nlohmann/json.hpp
+++ b/include/nlohmann/json.hpp
@@ -2829,7 +2829,7 @@ class basic_json
                    not detail::is_basic_json<ValueType>::value
 #ifndef _MSC_VER  // fix for issue #167 operator<< ambiguity under VS2015
                    and not std::is_same<ValueType, std::initializer_list<typename string_t::value_type>>::value
-#if defined(JSON_HAS_CPP_17) && _MSC_VER <= 1914
+#if defined(JSON_HAS_CPP_17) && defined(_MSC_VER) and _MSC_VER <= 1914
                    and not std::is_same<ValueType, typename std::string_view>::value
 #endif
 #endif
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index d640e891..d0c1f02f 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -13681,7 +13681,7 @@ class basic_json
                    not detail::is_basic_json<ValueType>::value
 #ifndef _MSC_VER  // fix for issue #167 operator<< ambiguity under VS2015
                    and not std::is_same<ValueType, std::initializer_list<typename string_t::value_type>>::value
-#if defined(JSON_HAS_CPP_17) && _MSC_VER <= 1914
+#if defined(JSON_HAS_CPP_17) && defined(_MSC_VER) and _MSC_VER <= 1914
                    and not std::is_same<ValueType, typename std::string_view>::value
 #endif
 #endif