diff --git a/aiida_hyperqueue/scheduler.py b/aiida_hyperqueue/scheduler.py
index c4df16b..793a608 100644
--- a/aiida_hyperqueue/scheduler.py
+++ b/aiida_hyperqueue/scheduler.py
@@ -29,7 +29,12 @@
 class HyperQueueJobResource(JobResource):
     """Class for HyperQueue job resources."""
 
-    _default_fields = ("num_cpus", "memory_mb", "num_machines", "num_mpiprocs_per_machine")
+    _default_fields = (
+        "num_cpus",
+        "memory_mb",
+        "num_machines",
+        "num_mpiprocs_per_machine",
+    )
 
     _features = {
         "can_query_by_user": False,