diff --git a/src/qlever/commands/index.py b/src/qlever/commands/index.py
index 358c4362..d350edd8 100644
--- a/src/qlever/commands/index.py
+++ b/src/qlever/commands/index.py
@@ -64,7 +64,7 @@ def execute(self, args) -> bool:
         total_file_size = get_total_file_size(
                 shlex.split(args.input_files))
         if total_file_size > 1e10:
-            index_cmd = f"ulimit -Sn 1048576; {index_cmd}"
+            index_cmd = f"ulimit -Hn 1048576 && ulimit -Sn 1048576 && {index_cmd}"
 
         # Run the command in a container (if so desired).
         if args.system in Containerize.supported_systems():