diff --git a/test_harness.py b/test_harness.py
index 450c6f9..94bbcef 100644
--- a/test_harness.py
+++ b/test_harness.py
@@ -64,7 +64,14 @@ def _run_command(namespace, num_devices, command):
     if namespace.log_level > 0:
         print(f"Test: loopback device info scan to be added here, on {devices}.")
         for device in devices:
-            diagcmd = ["blockdev", "--getss", "--getpbsz", "--getiomin", "--getioopt", device]
+            diagcmd = [
+                "blockdev",
+                "--getss",
+                "--getpbsz",
+                "--getiomin",
+                "--getioopt",
+                device,
+            ]
             with subprocess.Popen(diagcmd, stdout=subprocess.PIPE) as proc:
                 blockdevoutput = proc.stdout.readline().strip().decode("utf-8")
             print(blockdevoutput)