diff --git a/CHANGELOG.md b/CHANGELOG.md
index b8633bf..f1ee744 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
   a plan with a single change type with a single value, e.g. CNAME.
 * Support added for config env variable expansion on nested levels, not just
   top-level provider/processor keys
+* _ChunkedValue ASCII validation added, SPF & TXT
 
 ## v1.4.0 - 2023-12-04 - Minor Meta
 
diff --git a/octodns/record/chunked.py b/octodns/record/chunked.py
index 976baea..3f088e3 100644
--- a/octodns/record/chunked.py
+++ b/octodns/record/chunked.py
@@ -52,6 +52,10 @@ class _ChunkedValue(str):
         for value in data:
             if cls._unescaped_semicolon_re.search(value):
                 reasons.append(f'unescaped ; in "{value}"')
+            try:
+                value.encode('ascii')
+            except UnicodeEncodeError:
+                reasons.append(f'non ASCII character in "{value}"')
         return reasons
 
     @classmethod
diff --git a/tests/test_octodns_record_chunked.py b/tests/test_octodns_record_chunked.py
index ded2e9b..30592cc 100644
--- a/tests/test_octodns_record_chunked.py
+++ b/tests/test_octodns_record_chunked.py
@@ -37,3 +37,33 @@ class TestRecordChunked(TestCase):
         zone = Zone('unit.tests.', [])
         a = SpfRecord(zone, 'a', {'ttl': 42, 'value': 'some.target.'})
         self.assertEqual('some.target.', a.values[0].rdata_text)
+
+
+class TestChunkedValue(TestCase):
+    def test_validate(self):
+        # valid stuff
+        for data in ('a', 'ab', 'abcdefg', 'abc def', 'abc\\; def'):
+            self.assertFalse(_ChunkedValue.validate(data, 'TXT'))
+            self.assertFalse(_ChunkedValue.validate([data], 'TXT'))
+
+        # missing
+        for data in (None, []):
+            self.assertEqual(
+                ['missing value(s)'], _ChunkedValue.validate(data, 'TXT')
+            )
+
+        # unescaped ;
+        self.assertEqual(
+            ['unescaped ; in "hello; world"'],
+            _ChunkedValue.validate('hello; world', 'TXT'),
+        )
+
+        # non-asci
+        self.assertEqual(
+            ['non ASCII character in "v=spf1 –all"'],
+            _ChunkedValue.validate('v=spf1 –all', 'TXT'),
+        )
+        self.assertEqual(
+            ['non ASCII character in "Déjà vu"'],
+            _ChunkedValue.validate('Déjà vu', 'TXT'),
+        )