diff --git a/stdlib/unicodedata.pyi b/stdlib/unicodedata.pyi
index 35ab6d609..5c6749c8a 100644
--- a/stdlib/unicodedata.pyi
+++ b/stdlib/unicodedata.pyi
@@ -11,6 +11,8 @@ if sys.version_info < (3, 10):
 
 _T = TypeVar("_T")
 
+_NormalizationForm: TypeAlias = Literal["NFC", "NFD", "NFKC", "NFKD"]
+
 def bidirectional(__chr: str) -> str: ...
 def category(__chr: str) -> str: ...
 def combining(__chr: str) -> int: ...
@@ -27,14 +29,14 @@ def digit(__chr: str, __default: _T) -> int | _T: ...
 _EastAsianWidth: TypeAlias = Literal["F", "H", "W", "Na", "A", "N"]
 
 def east_asian_width(__chr: str) -> _EastAsianWidth: ...
-def is_normalized(__form: str, __unistr: str) -> bool: ...
+def is_normalized(__form: _NormalizationForm, __unistr: str) -> bool: ...
 def lookup(__name: str | ReadOnlyBuffer) -> str: ...
 def mirrored(__chr: str) -> int: ...
 @overload
 def name(__chr: str) -> str: ...
 @overload
 def name(__chr: str, __default: _T) -> str | _T: ...
-def normalize(__form: str, __unistr: str) -> str: ...
+def normalize(__form: _NormalizationForm, __unistr: str) -> str: ...
 @overload
 def numeric(__chr: str) -> float: ...
 @overload
@@ -57,14 +59,14 @@ class UCD:
     @overload
     def digit(self, __chr: str, __default: _T) -> int | _T: ...
     def east_asian_width(self, __chr: str) -> _EastAsianWidth: ...
-    def is_normalized(self, __form: str, __unistr: str) -> bool: ...
+    def is_normalized(self, __form: _NormalizationForm, __unistr: str) -> bool: ...
     def lookup(self, __name: str | ReadOnlyBuffer) -> str: ...
     def mirrored(self, __chr: str) -> int: ...
     @overload
     def name(self, __chr: str) -> str: ...
     @overload
     def name(self, __chr: str, __default: _T) -> str | _T: ...
-    def normalize(self, __form: str, __unistr: str) -> str: ...
+    def normalize(self, __form: _NormalizationForm, __unistr: str) -> str: ...
     @overload
     def numeric(self, __chr: str) -> float: ...
     @overload