diff --git a/link_test/link_tester.py b/link_test/link_tester.py
index 990e89eb..15171f31 100644
--- a/link_test/link_tester.py
+++ b/link_test/link_tester.py
@@ -52,6 +52,6 @@ def run(n_chips=None):
 
 if __name__ == "__main__":
     n_chips = None
-    if len(sys.argv) > 0:
-        n_chips = int(sys.argv[0])
+    if len(sys.argv) > 1:
+        n_chips = int(sys.argv[1])
     run(n_chips)
diff --git a/link_test/run_link_test.py b/link_test/run_link_test.py
index 8917da90..547f5325 100644
--- a/link_test/run_link_test.py
+++ b/link_test/run_link_test.py
@@ -97,7 +97,7 @@ def test_run(x, y):
 
 if __name__ == "__main__":
     n_chips = None
-    if len(sys.argv) > 0:
-        n_chips = int(sys.argv[0])
+    if len(sys.argv) > 1:
+        n_chips = int(sys.argv[1])
     link_test = LinkTest()
     link_test.do_run(n_chips)