diff --git a/AK/Utf16View.cpp b/AK/Utf16View.cpp
index a653cb1dc82..cc308c4157e 100644
--- a/AK/Utf16View.cpp
+++ b/AK/Utf16View.cpp
@@ -26,11 +26,6 @@ bool validate_utf16_be(ReadonlyBytes bytes)
     return simdutf::validate_utf16be(reinterpret_cast<char16_t const*>(bytes.data()), bytes.size() / 2);
 }
 
-size_t utf16_code_unit_length_from_utf8(StringView string)
-{
-    return simdutf::utf16_length_from_utf8(string.characters_without_null_termination(), string.length());
-}
-
 ErrorOr<String> Utf16View::to_utf8(AllowLonelySurrogates allow_lonely_surrogates) const
 {
     if (is_empty())
diff --git a/AK/Utf16View.h b/AK/Utf16View.h
index c459f9358b9..751c8a49bca 100644
--- a/AK/Utf16View.h
+++ b/AK/Utf16View.h
@@ -28,8 +28,6 @@ namespace AK {
 [[nodiscard]] bool validate_utf16_le(ReadonlyBytes);
 [[nodiscard]] bool validate_utf16_be(ReadonlyBytes);
 
-size_t utf16_code_unit_length_from_utf8(StringView);
-
 namespace Detail {
 
 static constexpr inline auto UTF16_FLAG = NumericLimits<size_t>::digits() - 1;
diff --git a/Tests/AK/TestUtf16View.cpp b/Tests/AK/TestUtf16View.cpp
index 3a7ed789b15..99562ae657c 100644
--- a/Tests/AK/TestUtf16View.cpp
+++ b/Tests/AK/TestUtf16View.cpp
@@ -86,14 +86,6 @@ TEST_CASE(decode_utf16)
     EXPECT_EQ(i, expected.size());
 }
 
-TEST_CASE(utf16_code_unit_length_from_utf8)
-{
-    EXPECT_EQ(AK::utf16_code_unit_length_from_utf8(""sv), 0uz);
-    EXPECT_EQ(AK::utf16_code_unit_length_from_utf8("abc"sv), 3uz);
-    EXPECT_EQ(AK::utf16_code_unit_length_from_utf8("😀"sv), 2uz);
-    EXPECT_EQ(AK::utf16_code_unit_length_from_utf8("Привет, мир! 😀 γειά σου κόσμος こんにちは世界"sv), 39uz);
-}
-
 TEST_CASE(null_view)
 {
     Utf16View view;