diff --git a/stdlib/_ast.pyi b/stdlib/_ast.pyi
index cb13c7452081..1305b0c94d9b 100644
--- a/stdlib/_ast.pyi
+++ b/stdlib/_ast.pyi
@@ -319,7 +319,7 @@ class FormattedValue(expr):
     if sys.version_info >= (3, 10):
         __match_args__ = ("value", "conversion", "format_spec")
     value: expr
-    conversion: int | None
+    conversion: int
     format_spec: expr | None
 
 class JoinedStr(expr):
diff --git a/tests/stubtest_allowlists/py39.txt b/tests/stubtest_allowlists/py39.txt
index 47992c880177..b947ee091b55 100644
--- a/tests/stubtest_allowlists/py39.txt
+++ b/tests/stubtest_allowlists/py39.txt
@@ -164,3 +164,7 @@ typing._SpecialForm.__mro_entries__
 unicodedata.UCD.is_normalized
 xml.parsers.expat.XMLParserType.SkippedEntityHandler
 xml.parsers.expat.XMLParserType.intern
+
+# None on the class, but never None on instances
+ast.FormattedValue.conversion
+_ast.FormattedValue.conversion