diff --git a/tests/test_ensemble.py b/tests/test_ensemble.py
index f86160e7..0d7a3f5d 100644
--- a/tests/test_ensemble.py
+++ b/tests/test_ensemble.py
@@ -947,11 +947,11 @@ def test_read_eclgrid():
 
 def fipnum2zone():
     """Helper function for injecting mocked frame into
-   each realization
+    each realization
 
-   This function must be global to the module for
-   concurrent.futures to able to pickle it.
-   """
+    This function must be global to the module for
+    concurrent.futures to able to pickle it.
+    """
     return pd.DataFrame(
         columns=["FIPNUM", "ZONE"],
         data=[