diff --git a/drinks_touch/database/models/account.py b/drinks_touch/database/models/account.py
index 0c684e73..4a40d919 100644
--- a/drinks_touch/database/models/account.py
+++ b/drinks_touch/database/models/account.py
@@ -32,7 +32,7 @@ class Account(Base):
     summary_email_notification_setting = Column(String(50), unique=False)
 
     @staticmethod
-    def sync_all_from_ldap(progress=None):
+    def sync_all_from_ldap(progress=None, was_killed=None):
         if progress is None:
             progress = lambda *args, **kwargs: None  # noqa: E731
 
@@ -43,6 +43,8 @@ def sync_all_from_ldap(progress=None):
         # Not really necessary, but it's nice to keep history.
         ldap_users = sorted(ldap_users, key=lambda x: x["id"] or math.inf)
         for i, user in enumerate(ldap_users):
+            if was_killed is not None and was_killed():
+                raise Exception("Task was killed")
             progress(i / len(ldap_users))
             if user["id"] == 10000 and user["name"] == "malled2":
                 # malled how did you manage to get two accounts with the same id?
diff --git a/drinks_touch/tasks/sync_from_ldap.py b/drinks_touch/tasks/sync_from_ldap.py
index 566c28fd..04c8ea37 100644
--- a/drinks_touch/tasks/sync_from_ldap.py
+++ b/drinks_touch/tasks/sync_from_ldap.py
@@ -17,4 +17,6 @@ def set_progress(progress):
         self.progress = 0
 
         with Session.begin():
-            Account.sync_all_from_ldap(progress=set_progress)
+            Account.sync_all_from_ldap(
+                progress=set_progress, was_killed=lambda: self.sig_killed
+            )