diff --git a/lstchain/scripts/tests/test_lstchain_scripts.py b/lstchain/scripts/tests/test_lstchain_scripts.py
index f3db91106..073e73164 100644
--- a/lstchain/scripts/tests/test_lstchain_scripts.py
+++ b/lstchain/scripts/tests/test_lstchain_scripts.py
@@ -366,6 +366,7 @@ def test_lstchain_merged_dl1_to_dl2(
         "lstchain_dl1_to_dl2",
         "-f",
         simulated_dl1_file_,
+        "-f",
         merged_simulated_dl1_file,
         "-p",
         rf_models["path"],