diff --git a/dkist/wcs/models.py b/dkist/wcs/models.py
index ab3a5e7c..7c44df00 100755
--- a/dkist/wcs/models.py
+++ b/dkist/wcs/models.py
@@ -130,7 +130,7 @@ def update_celestial_transform_parameters(
         -crpix[0],
         -crpix[1],
         pc,
-        transform[2].translation.value * pc.unit if hasattr(pc, "unit") else transform[2].translation.value,
+        transform[2].translation.quantity if hasattr(pc, "unit") else transform[2].translation.value,
         cdelt[0],
         cdelt[1],
         crval[0],