diff --git a/tests/test_parse_unicode.cpp b/tests/test_parse_unicode.cpp
index 42c692f..6d851a4 100644
--- a/tests/test_parse_unicode.cpp
+++ b/tests/test_parse_unicode.cpp
@@ -15,24 +15,25 @@ BOOST_AUTO_TEST_CASE(test_hard_example_unicode)
 
     const auto the = toml::get<toml::Table>(data.at("the"));
     BOOST_CHECK_EQUAL(toml::get<std::string>(the.at("test_string")),
-                      u8"Ýôú'ℓℓ λáƭè ₥è áƒƭèř ƭλïƨ - #");
+                      std::string(u8"Ýôú'ℓℓ λáƭè ₥è áƒƭèř ƭλïƨ - #"));
 
     const auto hard = toml::get<toml::Table>(the.at("hard"));
     const std::vector<std::string> expected_the_hard_test_array{"] ", " # "};
     BOOST_CHECK(toml::get<std::vector<std::string>>(hard.at("test_array")) ==
                 expected_the_hard_test_array);
     const std::vector<std::string> expected_the_hard_test_array2{
-        u8"Tèƨƭ #11 ]ƥřôƲèδ ƭλáƭ", u8"Éжƥèřï₥èñƭ #9 ωáƨ á ƨúççèƨƨ"};
+            std::string(u8"Tèƨƭ #11 ]ƥřôƲèδ ƭλáƭ"),
+            std::string(u8"Éжƥèřï₥èñƭ #9 ωáƨ á ƨúççèƨƨ")};
     BOOST_CHECK(toml::get<std::vector<std::string>>(hard.at("test_array2")) ==
                 expected_the_hard_test_array2);
     BOOST_CHECK_EQUAL(toml::get<std::string>(hard.at("another_test_string")),
-                      u8"§á₥è ƭλïñϱ, βúƭ ωïƭλ á ƨƭřïñϱ #");
+                      std::string(u8"§á₥è ƭλïñϱ, βúƭ ωïƭλ á ƨƭřïñϱ #"));
     BOOST_CHECK_EQUAL(toml::get<std::string>(hard.at("harder_test_string")),
-                      u8" Âñδ ωλèñ \"'ƨ ářè ïñ ƭλè ƨƭřïñϱ, áℓôñϱ ωïƭλ # \"");
+                      std::string(u8" Âñδ ωλèñ \"'ƨ ářè ïñ ƭλè ƨƭřïñϱ, áℓôñϱ ωïƭλ # \""));
 
     const auto bit = toml::get<toml::Table>(hard.at(std::string(u8"βïƭ#")));
     BOOST_CHECK_EQUAL(toml::get<std::string>(bit.at(std::string(u8"ωλáƭ?"))),
-                      u8"Ýôú δôñ'ƭ ƭλïñƙ ƨô₥è úƨèř ωôñ'ƭ δô ƭλáƭ?");
+                      std::string(u8"Ýôú δôñ'ƭ ƭλïñƙ ƨô₥è úƨèř ωôñ'ƭ δô ƭλáƭ?"));
     const std::vector<std::string> expected_multi_line_array{"]"};
     BOOST_CHECK(toml::get<std::vector<std::string>>(bit.at("multi_line_array")) ==
                 expected_multi_line_array);