diff --git a/allianceauth/authentication/views.py b/allianceauth/authentication/views.py
index 15c746c7..2a06f11c 100644
--- a/allianceauth/authentication/views.py
+++ b/allianceauth/authentication/views.py
@@ -172,6 +172,8 @@ def sso_login(request, token):
             # Go to Step 2
             return redirect('registration_register')
     messages.error(request, _('Unable to authenticate as the selected character.'))
+    # Logging in with an alt is not allowed due to security concerns.
+    token.delete()
     return redirect(settings.LOGIN_URL)