diff --git a/src/DIRAC/WorkloadManagementSystem/Agent/JobCleaningAgent.py b/src/DIRAC/WorkloadManagementSystem/Agent/JobCleaningAgent.py
index 948db5c66f8..28631f4a7fa 100644
--- a/src/DIRAC/WorkloadManagementSystem/Agent/JobCleaningAgent.py
+++ b/src/DIRAC/WorkloadManagementSystem/Agent/JobCleaningAgent.py
@@ -211,7 +211,7 @@ def deleteJobsByStatus(self, condDict, delay=False):
 
         failedJobs = result["Value"][JobStatus.FAILED]
         for job in failedJobs:
-            jobList.pop(jobList.index(job))
+            jobList.pop(jobList.index(str(job)))
         if not jobList:
             return S_OK()