diff --git a/fastapi/openapi/constants.py b/fastapi/openapi/constants.py
index 78a7ba735..01f543869 100644
--- a/fastapi/openapi/constants.py
+++ b/fastapi/openapi/constants.py
@@ -1,4 +1,6 @@
-from typing import Annotated, Literal
+from typing import Literal
+
+from typing_extensions import Annotated
 
 METHODS_WITH_BODY = {"GET", "HEAD", "POST", "PUT", "DELETE", "PATCH"}
 REF_PREFIX = "#/components/schemas/"