diff --git a/.mypyignore-todo b/.mypyignore-todo
index 3928084e..8be926ba 100644
--- a/.mypyignore-todo
+++ b/.mypyignore-todo
@@ -1,5 +1,3 @@
-scipy.cluster.vq.whiten
-
 scipy.interpolate.RectBivariateSpline.__init__
 scipy.interpolate._bsplines.make_smoothing_spline
 scipy.interpolate._fitpack2.RectBivariateSpline.__init__
diff --git a/scipy-stubs/cluster/vq.pyi b/scipy-stubs/cluster/vq.pyi
index 6934fac0..2518d39c 100644
--- a/scipy-stubs/cluster/vq.pyi
+++ b/scipy-stubs/cluster/vq.pyi
@@ -21,9 +21,9 @@ class ClusterError(Exception): ...
 
 #
 @overload
-def whiten(obs: onp.ArrayND[np.bool_ | np.integer[Any]], check_finite: bool = True) -> onp.Array2D[np.float64]: ...
+def whiten(obs: onp.ArrayND[np.bool_ | np.integer[Any]], check_finite: bool | None = None) -> onp.Array2D[np.float64]: ...
 @overload
-def whiten(obs: onp.ArrayND[_InexactT], check_finite: bool = True) -> onp.Array2D[_InexactT]: ...
+def whiten(obs: onp.ArrayND[_InexactT], check_finite: bool | None = None) -> onp.Array2D[_InexactT]: ...
 
 #
 @overload