diff --git a/tests/test_hstrat/test_dataframe/test_surface_build_tree_cli.py b/tests/test_hstrat/test_dataframe/test_surface_build_tree_cli.py
index f8bff325..624da689 100644
--- a/tests/test_hstrat/test_dataframe/test_surface_build_tree_cli.py
+++ b/tests/test_hstrat/test_dataframe/test_surface_build_tree_cli.py
@@ -30,7 +30,7 @@ def test_surface_build_tree_cli_version():
 
 
 def test_surface_build_tree_cli_csv():
-    output_file = "/tmp/hstrat_surface_build_tree.pqt"
+    output_file = "/tmp/hstrat_surface_build_tree.csv"
     pathlib.Path(output_file).unlink(missing_ok=True)
     subprocess.run(
         [