diff --git a/src/aiida/engine/processes/calcjobs/manager.py b/src/aiida/engine/processes/calcjobs/manager.py
index 75b9bb6ab1..700f166826 100644
--- a/src/aiida/engine/processes/calcjobs/manager.py
+++ b/src/aiida/engine/processes/calcjobs/manager.py
@@ -114,7 +114,7 @@ async def _get_jobs_from_scheduler(self) -> Dict[Hashable, 'JobInfo']:
             self.logger.info(f'AuthInfo<{self._authinfo.pk}>: successfully retrieved status of active jobs')
 
             for job_id, job_info in scheduler_response.items():
-                jobs_cache[job_id] = job_info
+                jobs_cache[str(job_id)] = job_info
 
             return jobs_cache