diff --git a/stdlib/hmac.pyi b/stdlib/hmac.pyi
index c5ab94c6ca4b..dc29836b6b87 100644
--- a/stdlib/hmac.pyi
+++ b/stdlib/hmac.pyi
@@ -23,7 +23,7 @@ if sys.version_info >= (3, 8):
     def new(key: bytes | bytearray, *, digestmod: _DigestMod) -> HMAC: ...
 
 else:
-    def new(key: bytes, msg: ReadableBuffer | None = ..., digestmod: _DigestMod | None = ...) -> HMAC: ...
+    def new(key: bytes | bytearray, msg: ReadableBuffer | None = ..., digestmod: _DigestMod | None = ...) -> HMAC: ...
 
 class HMAC:
     digest_size: int