diff --git a/djoser/constants.py b/djoser/constants.py
index 6df3a5d9..57be35d4 100644
--- a/djoser/constants.py
+++ b/djoser/constants.py
@@ -3,6 +3,9 @@
 
 class Messages:
     INVALID_CREDENTIALS_ERROR = _("Unable to log in with provided credentials.")
+    INACTIVE_ACCOUNT_ERROR = _(
+        "User account is disabled."
+    )  # not in use since Django 1.10
     INVALID_TOKEN_ERROR = _("Invalid token for given user.")
     INVALID_UID_ERROR = _("Invalid user id or user doesn't exist.")
     STALE_TOKEN_ERROR = _("Stale token for given user.")