diff --git a/tests/unit/metadata/test_multi_table.py b/tests/unit/metadata/test_multi_table.py
index 2749e277f..561d1f688 100644
--- a/tests/unit/metadata/test_multi_table.py
+++ b/tests/unit/metadata/test_multi_table.py
@@ -2393,13 +2393,20 @@ def test_detect_from_csvs(self, load_data_mock, tmp_path):
 
         data1 = pd.DataFrame({'col1': [1, 2], 'col2': [3, 4]})
         data2 = pd.DataFrame({'col1': [5, 6], 'col2': [7, 8]})
-        load_data_mock.side_effect = [data2, data1]
 
         filepath1 = tmp_path / 'table1.csv'
         filepath2 = tmp_path / 'table2.csv'
         data1.to_csv(filepath1, index=False)
         data2.to_csv(filepath2, index=False)
 
+        def load_data_side_effect(filepath, _):
+            if filepath.name == 'table1.csv':
+                return data1
+            elif filepath.name == 'table2.csv':
+                return data2
+
+        load_data_mock.side_effect = load_data_side_effect
+
         json_filepath = tmp_path / 'not_csv.json'
         with open(json_filepath, 'w') as json_file:
             json_file.write('{"key": "value"}')