diff --git a/changelog/309.bugfix.rst b/changelog/309.bugfix.rst
new file mode 100644
index 00000000..0372e13c
--- /dev/null
+++ b/changelog/309.bugfix.rst
@@ -0,0 +1 @@
+Fix broadcasting issues during pixel -> world conversion for models with a Ravel component.
diff --git a/dkist/wcs/models.py b/dkist/wcs/models.py
index c684f419..97d08cc9 100755
--- a/dkist/wcs/models.py
+++ b/dkist/wcs/models.py
@@ -635,6 +635,7 @@ def evaluate(self, *inputs_):
         else:
             has_units = False
             input_values = inputs_
+        input_values = [item.flatten() if isinstance(item, np.ndarray) else item for item in input_values]
         # round the index values, but clip them if they exceed the array bounds
         # the bounds are one less than the shape dimension value
         array_bounds = np.array(self.array_shape) - 1