diff --git a/src/_pytest/assertion/util.py b/src/_pytest/assertion/util.py
index c0e4f4d20..618a93eca 100644
--- a/src/_pytest/assertion/util.py
+++ b/src/_pytest/assertion/util.py
@@ -460,7 +460,7 @@ def _compare_eq_cls(left: Any, right: Any, verbose: int) -> List[str]:
         fields_to_check = left._fields
     else:
         assert False
-        
+
     indent = "  "
     same = []
     diff = []