diff --git a/src/stcal/outlier_detection/utils.py b/src/stcal/outlier_detection/utils.py
index 00b577ace..d57879e2d 100644
--- a/src/stcal/outlier_detection/utils.py
+++ b/src/stcal/outlier_detection/utils.py
@@ -284,7 +284,20 @@ def calc_gwcs_pixmap(in_wcs, out_wcs, in_shape):
     log.debug("Bounding box from data shape: {}".format(bb))
 
     grid = gwcs.wcstools.grid_from_bounding_box(bb)
-    return np.dstack(reproject(in_wcs, out_wcs)(grid[0], grid[1]))
+
+    # temporarily disable the bounding box:
+    if hasattr(out_wcs, "bounding_box"):
+        orig_bbox = getattr(out_wcs, "bounding_box", None)
+        out_wcs.bounding_box = None
+    else:
+        orig_bbox = None
+    try:
+        pixmap = np.dstack(reproject(in_wcs, out_wcs)(grid[0], grid[1]))
+    finally:
+        if orig_bbox is not None:
+            out_wcs.bounding_box = orig_bbox
+
+    return pixmap
 
 
 def reproject(wcs1, wcs2):