diff --git a/tests/basictest.cpp b/tests/basictest.cpp
index d1b377a..8f26902 100644
--- a/tests/basictest.cpp
+++ b/tests/basictest.cpp
@@ -656,7 +656,7 @@ TEST_CASE("decimal_point_parsing") {
 
     answer = fast_float::from_chars_advanced(
         input.data(), input.data() + input.size(), result,
-        fast_float::parse_options(fast_float::chars_format::general, ',', 10));
+        fast_float::parse_options({fast_float::chars_format::general, ',', 10}));
     CHECK_MESSAGE(answer.ec == std::errc(), "expected parse success");
     CHECK_MESSAGE(answer.ptr == input.data() + input.size(),
                   "Parsing should have stopped at end");
@@ -666,7 +666,8 @@ TEST_CASE("decimal_point_parsing") {
     std::string const input = "1.25";
     auto answer = fast_float::from_chars_advanced(
         input.data(), input.data() + input.size(), result,
-        fast_float::parse_options(fast_float::chars_format::general, ',', 10));
+        fast_float::parse_options({fast_float::chars_format::general, ',',
+                                    10}));
     CHECK_MESSAGE(answer.ec == std::errc(), "expected parse success");
     CHECK_MESSAGE(answer.ptr == input.data() + 1,
                   "Parsing should have stopped at dot");
@@ -1323,8 +1324,8 @@ TEST_CASE("double.general") {
 
 TEST_CASE("double.decimal_point") {
   constexpr auto options = [] {
-    return fast_float::parse_options(fast_float::chars_format::general, ',',
-                                     10);
+    return fast_float::parse_options({fast_float::chars_format::general, ',',
+                                     10});
   }();
 
   // infinities
@@ -1641,8 +1642,8 @@ TEST_CASE("float.general") {
 
 TEST_CASE("float.decimal_point") {
   constexpr auto options = [] {
-    return fast_float::parse_options(fast_float::chars_format::general, ',',
-                                     10);
+    return fast_float::parse_options({fast_float::chars_format::general, ',',
+                                     10});
   }();
 
   // infinity
diff --git a/tests/example_comma_test.cpp b/tests/example_comma_test.cpp
index 40d6ec3..b77ad57 100644
--- a/tests/example_comma_test.cpp
+++ b/tests/example_comma_test.cpp
@@ -9,7 +9,7 @@ int main() {
   double result;
   auto answer = fast_float::from_chars_advanced(
       input.data(), input.data() + input.size(), result,
-      fast_float::parse_options{fast_float::chars_format::general, ','});
+      fast_float::parse_options({fast_float::chars_format::general, ','}));
   if ((answer.ec != std::errc()) || ((result != 3.1416))) {
     std::cerr << "parsing failure\n";
     return EXIT_FAILURE;
diff --git a/tests/fortran.cpp b/tests/fortran.cpp
index 0c7477f..2f49946 100644
--- a/tests/fortran.cpp
+++ b/tests/fortran.cpp
@@ -11,9 +11,9 @@ int main_readme() {
   double result;
   auto answer = fast_float::from_chars_advanced(
       input.data(), input.data() + input.size(), result,
-      fast_float::parse_options {
+      fast_float::parse_options ({
       fast_float::chars_format::fortran |
-      fast_float::chars_format::allow_leading_plus});
+      fast_float::chars_format::allow_leading_plus}));
   if ((answer.ec != std::errc()) || ((result != 10000))) {
     std::cerr << "parsing failure\n" << result << "\n";
     return EXIT_FAILURE;
@@ -37,9 +37,9 @@ int main() {
     double result;
     auto answer{fast_float::from_chars_advanced(f.data(), f.data() + f.size(),
                                                 result,
-      fast_float::parse_options {
+      fast_float::parse_options ({
       fast_float::chars_format::fortran |
-      fast_float::chars_format::allow_leading_plus})};
+      fast_float::chars_format::allow_leading_plus}))};
     if (answer.ec != std::errc() || result != expected[std::size_t(d)]) {
       std::cerr << "parsing failure on " << f << std::endl;
       return EXIT_FAILURE;
@@ -51,9 +51,9 @@ int main() {
     double result;
     auto answer{fast_float::from_chars_advanced(f.data(), f.data() + f.size(),
                                                 result,
-      fast_float::parse_options {
+      fast_float::parse_options ({
       fast_float::chars_format::fortran |
-      fast_float::chars_format::allow_leading_plus})};
+      fast_float::chars_format::allow_leading_plus}))};
     if (answer.ec != std::errc() || result != expected[std::size_t(d)]) {
       std::cerr << "parsing failure on " << f << std::endl;
       return EXIT_FAILURE;
@@ -65,9 +65,9 @@ int main() {
     double result;
     auto answer{fast_float::from_chars_advanced(f.data(), f.data() + f.size(),
                                                 result,
-      fast_float::parse_options {
+      fast_float::parse_options ({
       fast_float::chars_format::fortran |
-      fast_float::chars_format::allow_leading_plus})};
+      fast_float::chars_format::allow_leading_plus}))};
     if (answer.ec != std::errc() || result != expected[std::size_t(d)]) {
       std::cerr << "parsing failure on " << f << std::endl;
       return EXIT_FAILURE;
diff --git a/tests/json_fmt.cpp b/tests/json_fmt.cpp
index 10994db..bf3b402 100644
--- a/tests/json_fmt.cpp
+++ b/tests/json_fmt.cpp
@@ -9,9 +9,9 @@ int main_readme() {
   double result;
   auto answer = fast_float::from_chars_advanced(
       input.data(), input.data() + input.size(), result,
-      fast_float::parse_options options{
+      fast_float::parse_options options({
       fast_float::chars_format::json |
-      fast_float::chars_format::allow_leading_plus} // should be ignored
+      fast_float::chars_format::allow_leading_plus}) // should be ignored
       );
   if (answer.ec == std::errc()) {
     std::cerr << "should have failed\n";
@@ -25,9 +25,9 @@ int main_readme2() {
   double result;
   auto answer = fast_float::from_chars_advanced(
       input.data(), input.data() + input.size(), result,
-      fast_float::parse_options options{
+      fast_float::parse_options options({
       fast_float::chars_format::json |
-      fast_float::chars_format::allow_leading_plus} // should be ignored
+      fast_float::chars_format::allow_leading_plus}) // should be ignored
       );
   if (answer.ec == std::errc()) {
     std::cerr << "should have failed\n";
@@ -42,9 +42,9 @@ int main_readme3() {
   double result;
   auto answer = fast_float::from_chars_advanced(
       input.data(), input.data() + input.size(), result,
-      fast_float::parse_options options{
+      fast_float::parse_options options({
       fast_float::chars_format::json_or_infnan |
-      fast_float::chars_format::allow_leading_plus}; // should be ignored
+      fast_float::chars_format::allow_leading_plus}); // should be ignored
       );
   if (answer.ec != std::errc() || (!std::isinf(result))) {
     std::cerr << "should have parsed infinity\n";
@@ -136,9 +136,9 @@ int main() {
     auto const &expected_reason = reject[i].reason;
     auto answer = fast_float::parse_number_string<true>(
         f.data(), f.data() + f.size(),
-        fast_float::parse_options(
+        fast_float::parse_options({
             fast_float::chars_format::json |
-            fast_float::chars_format::allow_leading_plus)); // should be ignored
+            fast_float::chars_format::allow_leading_plus})); // should be ignored
     if (answer.valid) {
       std::cerr << "json parse accepted invalid json " << f << std::endl;
       return EXIT_FAILURE;