diff --git a/stubs/psycopg2/psycopg2/_psycopg.pyi b/stubs/psycopg2/psycopg2/_psycopg.pyi
index 1cde17a9a4de..ee6dfdcd303a 100644
--- a/stubs/psycopg2/psycopg2/_psycopg.pyi
+++ b/stubs/psycopg2/psycopg2/_psycopg.pyi
@@ -628,7 +628,7 @@ def adapt(obj: object, protocol=..., alternate=..., /) -> Any: ...
 def encrypt_password(
     password: str | bytes, user: str | bytes, scope: connection | cursor | None = None, algorithm: str | None = None
 ) -> str: ...
-def get_wait_callback() -> Incomplete | None: ...
+def get_wait_callback() -> Callable[[connection], object] | None: ...
 def libpq_version() -> int: ...
 def new_array_type(values: tuple[int, ...], name: str, baseobj: _type) -> _type: ...
 def new_type(
@@ -637,4 +637,4 @@ def new_type(
 def parse_dsn(dsn: str | bytes) -> dict[str, Any]: ...
 def quote_ident(ident: str | bytes, scope) -> str: ...
 def register_type(obj: _type, conn_or_curs: connection | cursor | None = None, /) -> None: ...
-def set_wait_callback(none: Callable[..., Incomplete] | None, /) -> None: ...
+def set_wait_callback(none: Callable[[connection], object] | None, /) -> None: ...