diff --git a/CMakeLists.txt b/CMakeLists.txt
index c6482c1f..d53ede6a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 2.15)
 project(iguana)
 
 if(MSVC)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++20")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /std:c++17")
 add_compile_options(/utf-8)
 ADD_DEFINITIONS(-D_CRT_SECURE_NO_WARNINGS)
 add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/bigobj>")
diff --git a/iguana/reflection.hpp b/iguana/reflection.hpp
index efe303e3..aad5dda3 100644
--- a/iguana/reflection.hpp
+++ b/iguana/reflection.hpp
@@ -911,7 +911,7 @@ constexpr const std::string_view get_name() {
 }
 
 namespace detail {
-#if __cplusplus < 201703L
+#if __cplusplus > 201703L
 template <auto ptr, auto ele>
 constexpr bool get_index_imple() {
   if constexpr (std::is_same_v<