diff --git a/src/subscript/csv_merge/csv_merge.py b/src/subscript/csv_merge/csv_merge.py
index a95f1b03a..e9fa6f7ee 100755
--- a/src/subscript/csv_merge/csv_merge.py
+++ b/src/subscript/csv_merge/csv_merge.py
@@ -68,7 +68,9 @@ def run(self, *args):
         args = parser.parse_args(args)
         logger.setLevel(logging.INFO)
         globbedfiles = glob_patterns(args.csvfiles)
-        csv_merge_main(csvfiles=globbedfiles, output=args.output)
+        csv_merge_main(
+            csvfiles=globbedfiles, output=args.output, memoryconservative=True
+        )
 
 
 def get_parser() -> argparse.ArgumentParser: