diff --git a/src/test_workflow/benchmark_test/benchmark_test_cluster.py b/src/test_workflow/benchmark_test/benchmark_test_cluster.py
index 268a4f146f..e28482181c 100644
--- a/src/test_workflow/benchmark_test/benchmark_test_cluster.py
+++ b/src/test_workflow/benchmark_test/benchmark_test_cluster.py
@@ -36,7 +36,7 @@ def __init__(
 
     def start(self) -> None:
 
-        command = f"curl http://{self.cluster_endpoint}" if self.args.insecure else f"curl https://{self.cluster_endpoint} -ku f'{self.args.username}:{self.args.password}'"
+        command = f"curl http://{self.cluster_endpoint}" if self.args.insecure else f"curl https://{self.cluster_endpoint} -ku {self.args.username}:{self.args.password}"
         logging.info(command)
         try:
             result = subprocess.run(command, shell=True, capture_output=True, timeout=5)