diff --git a/src/saturn_engine/worker_manager/services/sync.py b/src/saturn_engine/worker_manager/services/sync.py
index 7c5b8f96..1a52344a 100644
--- a/src/saturn_engine/worker_manager/services/sync.py
+++ b/src/saturn_engine/worker_manager/services/sync.py
@@ -26,21 +26,24 @@ def sync_jobs() -> None:
                         job_definition_name=job_definition.name,
                     )
 
-                    if (
-                        not last_job
-                        or croniter(
+                    if last_job:
+                        # If a job already exists, check it has completed and
+                        # the interval has elapsed to start a new one.
+                        if not last_job.completed_at:
+                            continue
+
+                        scheduled_at = croniter(
                             job_definition.minimal_interval,
                             last_job.started_at,
                         ).get_next(ret_type=datetime)
-                        < utcnow()
-                    ):
-                        job_name: str = f"{job_definition.name}-{int(time.time())}"
-                        queue = queues_store.create_queue(
-                            session=session, name=job_name
-                        )
-                        jobs_store.create_job(
-                            name=job_name,
-                            session=session,
-                            queue_name=queue.name,
-                            job_definition_name=job_definition.name,
-                        )
+                        if scheduled_at > utcnow():
+                            continue
+
+                    job_name: str = f"{job_definition.name}-{int(time.time())}"
+                    queue = queues_store.create_queue(session=session, name=job_name)
+                    jobs_store.create_job(
+                        name=job_name,
+                        session=session,
+                        queue_name=queue.name,
+                        job_definition_name=job_definition.name,
+                    )
diff --git a/tests/worker_manager/api/test_jobs.py b/tests/worker_manager/api/test_jobs.py
index a2bcca95..cd4d645d 100644
--- a/tests/worker_manager/api/test_jobs.py
+++ b/tests/worker_manager/api/test_jobs.py
@@ -240,6 +240,7 @@ def test_jobs_sync(
         session=session,
         queue_name=queue.name,
         job_definition_name="running",
+        started_at=utcnow() - timedelta(days=8),
     )
     jobs_store.create_job(
         name="due",
@@ -266,7 +267,7 @@ def test_jobs_sync(
         "items": [
             {
                 "completed_at": None,
-                "started_at": "2018-01-02T00:00:00+00:00",
+                "started_at": "2017-12-25T00:00:00+00:00",
                 "cursor": None,
                 "name": "running",
             },
@@ -298,7 +299,7 @@ def test_jobs_sync(
                 "completed_at": None,
                 "cursor": None,
                 "name": "running",
-                "started_at": "2018-01-02T00:00:00+00:00",
+                "started_at": "2017-12-25T00:00:00+00:00",
             },
             {
                 # The old due job, untouched