diff --git a/testing/test_dsession.py b/testing/test_dsession.py
index c01f899..ac686fb 100644
--- a/testing/test_dsession.py
+++ b/testing/test_dsession.py
@@ -201,5 +201,4 @@ def test_report_collection_diff_different():
     try:
         report_collection_diff(from_collection, to_collection, 1, 2)
     except AssertionError as e:
-
         assert unicode(e) == error_message
diff --git a/xdist/dsession.py b/xdist/dsession.py
index 2fe785c..e6ca9c8 100644
--- a/xdist/dsession.py
+++ b/xdist/dsession.py
@@ -135,8 +135,12 @@ class LoadScheduling:
         # XXX allow nodes to have different collections
         first_node, col = list(self.node2collection.items())[0]
         for node, collection in self.node2collection.items():
-            if collection != col:
-                report_collection_diff(col, collection, first_node.gateway.id, node.gateway.id)
+            report_collection_diff(
+                col,
+                collection,
+                first_node.gateway.id,
+                node.gateway.id,
+            )
 
         self.pending = col
         if not col: