diff --git a/tracetools_test/test/test_publisher.py b/tracetools_test/test/test_publisher.py
index f1adab4..0c15283 100644
--- a/tracetools_test/test/test_publisher.py
+++ b/tracetools_test/test/test_publisher.py
@@ -18,7 +18,7 @@ class TestPublisher(unittest.TestCase):
         base_path = '/tmp'
         test_node = 'test_publisher'
 
-        exit_code, full_path = run_and_trace(session_name_prefix, base_path, publisher_creation_events, None, PKG, test_node)
+        exit_code, full_path = run_and_trace(base_path, session_name_prefix, publisher_creation_events, None, PKG, test_node)
         self.assertEqual(exit_code, 0)
 
         trace_events = get_trace_event_names(full_path)
diff --git a/tracetools_test/test/test_subscription.py b/tracetools_test/test/test_subscription.py
index f5543cd..5caac19 100644
--- a/tracetools_test/test/test_subscription.py
+++ b/tracetools_test/test/test_subscription.py
@@ -19,7 +19,7 @@ class TestSubscription(unittest.TestCase):
         base_path = '/tmp'
         test_node = 'test_subscription'
 
-        exit_code, full_path = run_and_trace(session_name_prefix, base_path, subscription_creation_events, None, PKG, test_node)
+        exit_code, full_path = run_and_trace(base_path, session_name_prefix, subscription_creation_events, None, PKG, test_node)
         self.assertEqual(exit_code, 0)
 
         trace_events = get_trace_event_names(full_path)
diff --git a/tracetools_test/tracetools_test/utils.py b/tracetools_test/tracetools_test/utils.py
index 8fc6b27..823b946 100644
--- a/tracetools_test/tracetools_test/utils.py
+++ b/tracetools_test/tracetools_test/utils.py
@@ -15,7 +15,7 @@ from tracetools_trace.tools.lttng import (
     lttng_destroy,
 )
 
-def run_and_trace(session_name_prefix, base_path, ros_events, kernel_events, package_name, node_executable):
+def run_and_trace(base_path, session_name_prefix, ros_events, kernel_events, package_name, node_executable):
     session_name = f'{session_name_prefix}-{time.strftime("%Y%m%d%H%M%S")}'
     full_path = f'{base_path}/{session_name}'
     print(f'trace directory: {full_path}')