diff --git a/servicex_local/science_images.py b/servicex_local/science_images.py
index 5bb1021..c632d31 100644
--- a/servicex_local/science_images.py
+++ b/servicex_local/science_images.py
@@ -152,7 +152,7 @@ def write_kickoff_script(generated_files_dir: Path) -> None:
 
 file_to_run = info["command"]
 if file_to_run.startswith("/generated/"):
-    file_to_run = os.path.join(script_dir, file_to_run.removeprefix("/generated/"))
+    file_to_run = os.path.join(script_dir, file_to_run[len("/generated/"):])
 elif not os.path.isabs(file_to_run):
     file_to_run = os.path.join(script_dir, file_to_run)
 
@@ -283,7 +283,7 @@ def transform(
 
 file_to_run = info["command"]
 if file_to_run.startswith("/generated/"):
-    file_to_run = os.path.join(script_dir, file_to_run.removeprefix("/generated/"))
+    file_to_run = os.path.join(script_dir, file_to_run[len("/generated/"):])
 elif not os.path.isabs(file_to_run):
     file_to_run = os.path.join(script_dir, file_to_run)