diff --git a/include/fast_float/parse_number.h b/include/fast_float/parse_number.h
index 1f11a7c..2cac4a8 100644
--- a/include/fast_float/parse_number.h
+++ b/include/fast_float/parse_number.h
@@ -186,6 +186,7 @@ struct from_chars_caller<std::float64_t>
 
 
 template<typename T, typename UC, typename>
+FASTFLOAT_CONSTEXPR20
 from_chars_result_t<UC> from_chars(UC const * first, UC const * last,
                              T &value, chars_format fmt /*= chars_format::general*/)  noexcept  {
   return from_chars_caller<T>::call(first, last, value, parse_options_t<UC>(fmt));
diff --git a/tests/installation_tests/find/CMakeLists.txt b/tests/installation_tests/find/CMakeLists.txt
index 537ee24..1595267 100644
--- a/tests/installation_tests/find/CMakeLists.txt
+++ b/tests/installation_tests/find/CMakeLists.txt
@@ -4,7 +4,6 @@ project(test_install VERSION 0.1.0 LANGUAGES CXX)
 
 set(FASTFLOAT_CXX_STANDARD 17 CACHE STRING "the C++ standard to use for fastfloat")
 set(CMAKE_CXX_STANDARD ${FASTFLOAT_CXX_STANDARD})
-set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 if(MSVC_VERSION GREATER 1910)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -permissive-")