diff --git a/test/Jamfile b/test/Jamfile
index 37a680c..9fb3bc7 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -77,6 +77,7 @@ run hash_append_range_2.cpp ;
 
 compile append_byte_sized_cx.cpp ;
 run append_integer_cx.cpp ;
+run append_character_cx.cpp ;
 
 # non-cryptographic
 
diff --git a/test/append_character_cx.cpp b/test/append_character_cx.cpp
new file mode 100644
index 0000000..d79822e
--- /dev/null
+++ b/test/append_character_cx.cpp
@@ -0,0 +1,57 @@
+// Copyright 2024 Peter Dimov.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/hash2/hash_append.hpp>
+#include <boost/hash2/fnv1a.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/config.hpp>
+#include <cstdint>
+
+#if defined(BOOST_MSVC) && BOOST_MSVC < 1920
+# pragma warning(disable: 4307) // integral constant overflow
+#endif
+
+using namespace boost::hash2;
+
+template<class T> BOOST_CXX14_CONSTEXPR std::uint32_t test()
+{
+    T v[ 95 ] = {};
+
+    fnv1a_32 h;
+    hash_append( h, {}, v );
+
+    return h.result();
+}
+
+#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
+
+#if defined(BOOST_NO_CXX14_CONSTEXPR)
+
+# define TEST_EQ(x1, x2) BOOST_TEST_EQ(x1, x2)
+
+#else
+
+# define TEST_EQ(x1, x2) BOOST_TEST_EQ(x1, x2); STATIC_ASSERT(x1 == x2)
+
+#endif
+
+int main()
+{
+    std::uint32_t const r1 = 409807047;
+    std::uint32_t const r2 = 4291711997;
+    std::uint32_t const r4 = 3226601845;
+
+    TEST_EQ( test<char>(), r1 );
+
+    TEST_EQ( test<char16_t>(), r2 );
+    TEST_EQ( test<char32_t>(), r4 );
+
+    TEST_EQ( test<wchar_t>(), (sizeof(wchar_t) == sizeof(std::uint16_t)? r2: r4) );
+
+#if defined(__cpp_char8_t) && __cpp_char8_t >= 201811L
+    TEST_EQ( test<char8_t>(), r1 );
+#endif
+
+    return boost::report_errors();
+}