diff --git a/AK/Utf16View.cpp b/AK/Utf16View.cpp
index d9fd20c50ef..1ab94e296be 100644
--- a/AK/Utf16View.cpp
+++ b/AK/Utf16View.cpp
@@ -127,7 +127,8 @@ ErrorOr<ByteString> Utf16View::to_byte_string(AllowLonelySurrogates allow_lonely
 
 bool Utf16View::is_ascii() const
 {
-    return simdutf::validate_ascii(reinterpret_cast<char const*>(m_string), length_in_code_units() * sizeof(char16_t));
+    // FIXME: Petition simdutf to implement an ASCII validator for UTF-16.
+    return all_of(span(), AK::is_ascii);
 }
 
 bool Utf16View::validate(size_t& valid_code_units, AllowLonelySurrogates allow_lonely_surrogates) const
diff --git a/Tests/AK/TestUtf16View.cpp b/Tests/AK/TestUtf16View.cpp
index 95df2be7a9f..818ef7b197e 100644
--- a/Tests/AK/TestUtf16View.cpp
+++ b/Tests/AK/TestUtf16View.cpp
@@ -332,10 +332,12 @@ TEST_CASE(is_ascii)
     EXPECT(u"a"sv.is_ascii());
     EXPECT(u"foo"sv.is_ascii());
     EXPECT(u"foo\t\n\rbar\v\b123"sv.is_ascii());
+    EXPECT(u"The quick (\"brown\") fox can't jump 32.3 feet, right?"sv.is_ascii());
 
     EXPECT(!u"😀"sv.is_ascii());
     EXPECT(!u"foo 😀"sv.is_ascii());
     EXPECT(!u"😀 foo"sv.is_ascii());
+    EXPECT(!u"The quick (“brown”) fox can’t jump 32.3 feet, right?"sv.is_ascii());
 }
 
 TEST_CASE(equals_ignoring_case)