diff --git a/pkg/apis/batch/validation/validation_test.go b/pkg/apis/batch/validation/validation_test.go
index 4d1c9d97209..9fe06fada50 100644
--- a/pkg/apis/batch/validation/validation_test.go
+++ b/pkg/apis/batch/validation/validation_test.go
@@ -935,6 +935,22 @@ func TestValidateJobUpdate(t *testing.T) {
 				Field: "spec.completions",
 			},
 		},
+		"immutable completions for indexed job when AllowElasticIndexedJobs is false": {
+			old: batch.Job{
+				ObjectMeta: metav1.ObjectMeta{Name: "abc", Namespace: metav1.NamespaceDefault},
+				Spec: batch.JobSpec{
+					Selector: validGeneratedSelector,
+					Template: validPodTemplateSpecForGenerated,
+				},
+			},
+			update: func(job *batch.Job) {
+				job.Spec.Completions = pointer.Int32Ptr(1)
+			},
+			err: &field.Error{
+				Type:  field.ErrorTypeInvalid,
+				Field: "spec.completions",
+			},
+		},
 		"immutable selector": {
 			old: batch.Job{
 				ObjectMeta: metav1.ObjectMeta{Name: "abc", Namespace: metav1.NamespaceDefault},
diff --git a/pkg/registry/batch/job/strategy.go b/pkg/registry/batch/job/strategy.go
index e0b3d8104fd..4d485a06428 100644
--- a/pkg/registry/batch/job/strategy.go
+++ b/pkg/registry/batch/job/strategy.go
@@ -184,11 +184,10 @@ func validationOptionsForJob(newJob, oldJob *batch.Job) batchvalidation.JobValid
 		notStarted := oldJob.Status.StartTime == nil
 		opts.AllowMutableSchedulingDirectives = utilfeature.DefaultFeatureGate.Enabled(features.JobMutableNodeSchedulingDirectives) &&
 			suspended && notStarted
-
-		// Elastic indexed jobs (mutable completions iff updated parallelism == updated completions)
-		opts.AllowElasticIndexedJobs = utilfeature.DefaultFeatureGate.Enabled(features.ElasticIndexedJob)
 	}
 
+	// Elastic indexed jobs (mutable completions iff updated parallelism == updated completions)
+	opts.AllowElasticIndexedJobs = utilfeature.DefaultFeatureGate.Enabled(features.ElasticIndexedJob)
 	return opts
 }