diff --git a/check_zfs_zpool.py b/check_zfs_zpool.py
index 98816f5..209d35a 100755
--- a/check_zfs_zpool.py
+++ b/check_zfs_zpool.py
@@ -288,7 +288,7 @@ def main(args):
                            ', '.join([*set(warn_drives)])]
 
         if not len(warn_drives) and not len(crit_drives):
-            out_str = ['OK', '-', f'{len(vdev_devices)} {args.check_type} devices for {args.pool_name} are healthy']
+            out_str = ['OK', '-', f'{len([x for x in vdev_devices if not x["device"].startswith("mirror")])} {args.check_type} devices for {args.pool_name} are healthy']
 
         print(*out_str)
         print(list_to_markdown_table(table_data, align='left', seperator='!', borders=False))