diff --git a/src/DIRAC/WorkloadManagementSystem/Agent/JobAgent.py b/src/DIRAC/WorkloadManagementSystem/Agent/JobAgent.py
index d88fe0ef78a..80dbd4c3f66 100755
--- a/src/DIRAC/WorkloadManagementSystem/Agent/JobAgent.py
+++ b/src/DIRAC/WorkloadManagementSystem/Agent/JobAgent.py
@@ -694,7 +694,10 @@ def _checkSubmittedJobs(self):
         submissionErrors = []
         payloadErrors = []
         originalJobID = self.jobReport.jobID
-        for jobID, taskID in self.submissionDict.items():
+        # Loop over the jobIDs submitted to the CE
+        # Here we iterate over a copy of the keys because we are modifying the dictionary within the loop
+        for jobID in list(self.submissionDict.keys()):
+            taskID = self.submissionDict[jobID]
             if taskID not in self.computingElement.taskResults:
                 continue
 
@@ -731,7 +734,9 @@ def _checkSubmittedJobs(self):
                 self.log.info(message)
 
             # Remove taskID from computingElement.taskResults as it has been treated
+            # Remove jobID from submissionDict as it has been treated
             del self.computingElement.taskResults[taskID]
+            del self.submissionDict[jobID]
 
         self.jobReport.setJob(originalJobID)
         return S_OK((submissionErrors, payloadErrors))
diff --git a/src/DIRAC/WorkloadManagementSystem/Agent/test/Test_Agent_JobAgent.py b/src/DIRAC/WorkloadManagementSystem/Agent/test/Test_Agent_JobAgent.py
index 0495fb495de..2a53908c3a4 100644
--- a/src/DIRAC/WorkloadManagementSystem/Agent/test/Test_Agent_JobAgent.py
+++ b/src/DIRAC/WorkloadManagementSystem/Agent/test/Test_Agent_JobAgent.py
@@ -517,6 +517,7 @@ def test_submitAndCheckJob(mocker, localCE, job, expectedResult1, expectedResult
     jobAgent.log = gLogger.getSubLogger("JobAgent")
     jobAgent._initializeComputingElement(localCE)
     jobAgent.jobReport = JobReport(jobID)
+    jobAgent.jobSubmissionDelay = 3
 
     # Submit a job
     result = jobAgent._submitJob(
@@ -547,10 +548,6 @@ def test_submitAndCheckJob(mocker, localCE, job, expectedResult1, expectedResult
     assert result["OK"]
     assert result["Value"] == expectedResult1
 
-    # Check that the job is still present in jobAgent.submissionDict
-    assert len(jobAgent.submissionDict) == 1
-    assert jobID in jobAgent.submissionDict
-
     # If the submission is synchronous jobAgent.computingElement.taskResults
     # should not contain the result anymore: already processed by checkSubmittedJobs
     if not jobAgent.computingElement.ceParameters.get("AsyncSubmission", False):
@@ -576,7 +573,6 @@ def test_submitAndCheckJob(mocker, localCE, job, expectedResult1, expectedResult
     assert result["Value"] == expectedResult2
 
     # From here, taskResults should be empty
-    assert jobID in jobAgent.submissionDict
     assert len(jobAgent.computingElement.taskResults) == 0