diff --git a/jwst/assign_wcs/niriss.py b/jwst/assign_wcs/niriss.py
index 69698ffad6c..7cf8b8e70fd 100644
--- a/jwst/assign_wcs/niriss.py
+++ b/jwst/assign_wcs/niriss.py
@@ -6,7 +6,6 @@
 from astropy import units as u
 from astropy.modeling import bind_bounding_box
 from astropy.modeling.models import Const1D, Mapping, Identity, Shift
-from astropy.modeling.bounding_box import CompoundBoundingBox
 import gwcs.coordinate_frames as cf
 from gwcs import wcs
 
@@ -114,27 +113,6 @@ def _niriss_order_bounding_box(input_model, order):
         )
 
 
-def niriss_bounding_box(input_model):
-    """
-    Create a bounding box for the NIRISS model.
-
-    Parameters
-    ----------
-    input_model : JwstDataModel
-        The input datamodel.
-
-    Returns
-    -------
-    CompoundBoundingBox
-        The bounding box for the NIRISS model.
-    """
-    bbox = {(order,): _niriss_order_bounding_box(input_model, order) for order in [1, 2, 3]}
-    model = input_model.meta.wcs.forward_transform
-    return CompoundBoundingBox.validate(
-        model, bbox, slice_args=[("spectral_order", True)], order="F"
-    )
-
-
 def niriss_soss(input_model, reference_files):
     """
     Create the WCS pipeline for NIRISS SOSS data.