diff --git a/test/functional/feature_timestampindex.py b/test/functional/feature_timestampindex.py
index 86cb22297e1c3..9f3573e3220b7 100755
--- a/test/functional/feature_timestampindex.py
+++ b/test/functional/feature_timestampindex.py
@@ -35,7 +35,7 @@ def setup_network(self):
     def run_test(self):
         self.log.info("Test that settings can't be changed without -reindex...")
         self.stop_node(1)
-        self.start_node(1, ["-timestampindex=0")
+        self.start_node(1, ["-timestampindex=0"])
         self.connect_nodes(0, 1)
         self.sync_all()
         self.stop_node(1)