diff --git a/tests/library/find_unused_disk.py b/tests/library/find_unused_disk.py
index 0f57765..edd2156 100644
--- a/tests/library/find_unused_disk.py
+++ b/tests/library/find_unused_disk.py
@@ -188,7 +188,7 @@ def run_module():
     info = []
     for path, attrs in get_disks(module).items():
         if is_ignored(path):
-            info.append("Disk {} attrs {} is ignored".format(path, attrs))
+            info.append("Disk [%s] attrs [%s] is ignored" % (path, attrs))
             continue
 
         interface = module.params["with_interface"]