diff --git a/zfs-backup.py b/zfs-backup.py
index 2890df3..eb70e1d 100755
--- a/zfs-backup.py
+++ b/zfs-backup.py
@@ -13,6 +13,8 @@ from uuid import UUID
 
 import config
 
+EXIT_ERROR = 1
+
 ALREADY_DECRYPTED = "Cannot decrypt, already decrypted"
 ALREADY_IMPORTED = "Cannot import, already imported"
 CANNOT_FIND_BACKUP_DRIVE = "Could not find a backup drive"
@@ -322,8 +324,7 @@ class Disk:
         for item in MAPPER_PATH.iterdir():
             if self._mapper_entry == item.name:
                 print(MAPPER_ENTRY_ALREADY_EXISTS, self._mapper_entry)
-                # TODO exit code constants
-                exit(1)
+                exit(EXIT_ERROR)
 
     @property
     def _path(self) -> Path:
@@ -394,7 +395,7 @@ class ExternalPool(Pool):
                 return cls(pool_name, disk)
         else:
             print(CANNOT_FIND_BACKUP_DRIVE)
-            exit(1)
+            exit(EXIT_ERROR)
 
     def clean_old_snapshots(self):
         print("Cleaning old snapshots")
@@ -501,7 +502,7 @@ class Command:
 def verify_running_as_root():
     if getuid() > 0:
         print(RUN_AS_ROOT)
-        exit(1)
+        exit(EXIT_ERROR)
 
 
 if __name__ == "__main__":