diff --git a/src/jaeger/fvc.py b/src/jaeger/fvc.py
index 10ff947d..3deba250 100644
--- a/src/jaeger/fvc.py
+++ b/src/jaeger/fvc.py
@@ -396,7 +396,7 @@ def process_fvc_image(
             transforms.plotFVCResults = partial(plotFVCResultsMP, loop)
 
         # ZB polynomial orders to use.
-        polids = config["fvc"].get("polids", None)
+        polids = polids or config["fvc"].get("polids", None)
         if polids is None:
             self.log("Using coordio default ZB polynomial orders.")
         else:
diff --git a/tests/test_fvc.py b/tests/test_fvc.py
index bfa19178..7b06c2ba 100644
--- a/tests/test_fvc.py
+++ b/tests/test_fvc.py
@@ -123,6 +123,8 @@ async def test_fvc_processing(
         positioner_coords,
         fibre_data=fibre_data,
         centroid_method="nudge",
+        rot_ref_angle=135.4,
+        polids=numpy.arange(33).tolist(),
     )
 
     assert fvc.fitrms is not None and fvc.fitrms > 0.05 and fvc.fitrms < 0.06