diff --git a/finch/processes/wpsio.py b/finch/processes/wpsio.py
index a59986dd..40c17e17 100644
--- a/finch/processes/wpsio.py
+++ b/finch/processes/wpsio.py
@@ -203,8 +203,17 @@ def get_ensemble_inputs(novar=False):
         data_type="string",
         default=None,
         min_occurs=0,
-        allowed_values=list(set(list(
-            chain(*[d.allowed_values["variable"] for d in datasets_config.values()])))
+        allowed_values=list(
+            set(
+                list(
+                    chain(
+                        *[
+                            d.allowed_values["variable"]
+                            for d in datasets_config.values()
+                        ]
+                    )
+                )
+            )
         ),
     )
     return dataset, scenario, models, variable