diff --git a/openwrt_backup/config.py b/openwrt_backup/config.py
index 7e3996e..b3f9aba 100644
--- a/openwrt_backup/config.py
+++ b/openwrt_backup/config.py
@@ -18,6 +18,9 @@ CACHE_DIR = ensure_directory_exists(appdirs.user_cache_dir)
 CONFIG_FILE_PATH = CONFIG_DIR / "config.toml"
 PACKAGE_ROOT = Path(__file__).absolute().parent
 
+HOSTNAME = 1
+NUMBER = 0
+
 if not CONFIG_FILE_PATH.exists():
     shutil.copy(PACKAGE_ROOT / "config.toml", CONFIG_FILE_PATH)
 
diff --git a/openwrt_backup/prune.py b/openwrt_backup/prune.py
index 2c11236..43ae0c8 100644
--- a/openwrt_backup/prune.py
+++ b/openwrt_backup/prune.py
@@ -1,10 +1,14 @@
 from pathlib import Path
 
+from openwrt_backup.config import HOSTNAME, NUMBER
+
 
 def get_all_but_last_n(p: Path, n: int, hostname):
     files = list(p.glob("*.tar.gz"))
-    hostname_files = list(filter(lambda f: f.name.split("__")[1] == hostname, files))
+    hostname_files = list(
+        filter(lambda f: f.name.split("__")[HOSTNAME] == hostname, files)
+    )
     sorted_files = sorted(
-        hostname_files, key=lambda f: int(f.name.split("__")[0]), reverse=True
+        hostname_files, key=lambda f: int(f.name.split("__")[NUMBER]), reverse=True
     )
     return sorted_files[n:]
diff --git a/openwrt_backup/utils.py b/openwrt_backup/utils.py
index 203de94..ed132d0 100755
--- a/openwrt_backup/utils.py
+++ b/openwrt_backup/utils.py
@@ -5,6 +5,8 @@ from typing import Union
 
 import paramiko
 
+from openwrt_backup.config import HOSTNAME, NUMBER
+
 
 def client_from_config(name: str, ssh_config_root: Path):
     """Create a client from a Host entry in the .ssh/config file"""
@@ -59,10 +61,10 @@ def get_next_number(backup_path: Path, hostname):
     f_names = (path.name for path in backup_path.glob("*.tar.gz"))
     f_names_fields = map(lambda s: s.split("__"), f_names)
     f_names_fields_filtered = filter(
-        lambda fields: fields[1] == hostname, f_names_fields
+        lambda fields: fields[HOSTNAME] == hostname, f_names_fields
     )
     try:
-        return max(int(fields[0]) for fields in f_names_fields_filtered) + 1
+        return max(int(fields[NUMBER]) for fields in f_names_fields_filtered) + 1
     except ValueError:
         return 0