diff --git a/python/raft-ann-bench/src/raft-ann-bench/data_export/__main__.py b/python/raft-ann-bench/src/raft-ann-bench/data_export/__main__.py
index e19ada2934..911b0c0ea2 100644
--- a/python/raft-ann-bench/src/raft-ann-bench/data_export/__main__.py
+++ b/python/raft-ann-bench/src/raft-ann-bench/data_export/__main__.py
@@ -18,6 +18,7 @@
 import json
 import os
 import warnings
+import sys
 
 import pandas as pd
 
@@ -147,6 +148,9 @@ def main():
         default=default_dataset_path,
     )
 
+    if len(sys.argv)==1:
+        parser.print_help(sys.stderr)
+        sys.exit(1)
     args = parser.parse_args()
 
     convert_json_to_csv_build(args.dataset, args.dataset_path)
diff --git a/python/raft-ann-bench/src/raft-ann-bench/generate_groundtruth/__main__.py b/python/raft-ann-bench/src/raft-ann-bench/generate_groundtruth/__main__.py
index 77a930f81e..91f8cf04ce 100644
--- a/python/raft-ann-bench/src/raft-ann-bench/generate_groundtruth/__main__.py
+++ b/python/raft-ann-bench/src/raft-ann-bench/generate_groundtruth/__main__.py
@@ -16,6 +16,7 @@
 #
 import argparse
 import os
+import sys
 
 import cupy as cp
 import numpy as np
@@ -178,6 +179,9 @@ def main():
         " commonly used with RAFT ANN are 'sqeuclidean' and 'inner_product'",
     )
 
+    if len(sys.argv)==1:
+        parser.print_help(sys.stderr)
+        sys.exit(1)
     args = parser.parse_args()
 
     if args.rows is not None:
diff --git a/python/raft-ann-bench/src/raft-ann-bench/get_dataset/__main__.py b/python/raft-ann-bench/src/raft-ann-bench/get_dataset/__main__.py
index 4e6a0119b4..c16881bfb1 100644
--- a/python/raft-ann-bench/src/raft-ann-bench/get_dataset/__main__.py
+++ b/python/raft-ann-bench/src/raft-ann-bench/get_dataset/__main__.py
@@ -16,6 +16,7 @@
 import argparse
 import os
 import subprocess
+import sys
 from urllib.request import urlretrieve
 
 
@@ -101,6 +102,10 @@ def main():
         help="normalize cosine distance to inner product",
         action="store_true",
     )
+
+    if len(sys.argv)==1:
+        parser.print_help(sys.stderr)
+        sys.exit(1)
     args = parser.parse_args()
 
     download(args.dataset, args.normalize, args.dataset_path)
diff --git a/python/raft-ann-bench/src/raft-ann-bench/plot/__main__.py b/python/raft-ann-bench/src/raft-ann-bench/plot/__main__.py
index 78f8aea8b8..30be3682cc 100644
--- a/python/raft-ann-bench/src/raft-ann-bench/plot/__main__.py
+++ b/python/raft-ann-bench/src/raft-ann-bench/plot/__main__.py
@@ -22,6 +22,7 @@
 import argparse
 import itertools
 import os
+import sys
 from collections import OrderedDict
 
 import matplotlib as mpl
@@ -486,6 +487,9 @@ def main():
         action="store_true",
     )
 
+    if len(sys.argv)==1:
+        parser.print_help(sys.stderr)
+        sys.exit(1)
     args = parser.parse_args()
 
     if args.algorithms:
diff --git a/python/raft-ann-bench/src/raft-ann-bench/run/__main__.py b/python/raft-ann-bench/src/raft-ann-bench/run/__main__.py
index 38f23ddbcd..3bdb6fd42d 100644
--- a/python/raft-ann-bench/src/raft-ann-bench/run/__main__.py
+++ b/python/raft-ann-bench/src/raft-ann-bench/run/__main__.py
@@ -21,6 +21,7 @@
 import uuid
 from importlib import import_module
 
+import sys
 import warnings
 import yaml
 
@@ -293,6 +294,9 @@ def main():
         action="store_true",
     )
 
+    if len(sys.argv)==1:
+        parser.print_help(sys.stderr)
+        sys.exit(1)
     args = parser.parse_args()
 
     # If both build and search are not provided,
diff --git a/python/raft-ann-bench/src/raft-ann-bench/split_groundtruth/__main__.py b/python/raft-ann-bench/src/raft-ann-bench/split_groundtruth/__main__.py
index b886d40ea7..9efac1225c 100644
--- a/python/raft-ann-bench/src/raft-ann-bench/split_groundtruth/__main__.py
+++ b/python/raft-ann-bench/src/raft-ann-bench/split_groundtruth/__main__.py
@@ -16,6 +16,7 @@
 import argparse
 import os
 import subprocess
+import sys
 
 
 def split_groundtruth(groundtruth_filepath):
@@ -43,6 +44,10 @@ def main():
         help="Path to billion-scale dataset groundtruth file",
         required=True,
     )
+
+    if len(sys.argv)==1:
+        parser.print_help(sys.stderr)
+        sys.exit(1)
     args = parser.parse_args()
 
     split_groundtruth(args.groundtruth)