diff --git a/omv_backup.py b/omv_backup.py
index 100d4f2..a0a2f04 100755
--- a/omv_backup.py
+++ b/omv_backup.py
@@ -618,7 +618,7 @@ if _BACKUP:
                     #cmnd = "find {} -maxdepth 1 -type d -mtime +30 -exec rm -rf {{}} \;".format(BACKUP_DIR)
                     #cmnd = f"cd {BACKUP_ROOT} find ./ -maxdepth 1 -type d -mmin +30 -exec rm -rf {{}} \\;"
                     
-                    cmnd = "ls {BACKUP_ROOT}"
+                    cmnd = f"ls {BACKUP_ROOT}"
                     
                     
                     #print(cmnd)
@@ -642,7 +642,7 @@ if _BACKUP:
                             else:
                                 print("No match.")
                                 
-                    cmnd = "ls {BACKUP_ROOT}|grep _running"
+                    cmnd = f"ls {BACKUP_ROOT}|grep _running"
                     #print(cmnd)
                 #   input("????")
                     logging.info(f"removing obsolete dirs")