diff --git a/internal/manager/persistence/jobs_blocklist.go b/internal/manager/persistence/jobs_blocklist.go
index 12dc5103..c12b09b7 100644
--- a/internal/manager/persistence/jobs_blocklist.go
+++ b/internal/manager/persistence/jobs_blocklist.go
@@ -108,17 +108,16 @@ func (db *DB) WorkersLeftToRun(ctx context.Context, job *Job, taskType string) (
 		Select("uuid").
 		Where("id not in (?)", blockedWorkers)
 
-	if job.WorkerClusterID != nil {
-		// Count workers not in any cluster + workers in the job's cluster.
-		clusterless := db.gormDB.
-			Table("worker_cluster_membership").
-			Select("worker_id")
+	if job.WorkerClusterID == nil {
+		// Count all workers, so no extra restrictions are necessary.
+	} else {
+		// Only count workers in the job's cluster.
 		jobCluster := db.gormDB.
 			Table("worker_cluster_membership").
 			Select("worker_id").
 			Where("worker_cluster_id = ?", *job.WorkerClusterID)
 		query = query.
-			Where("id not in (?) or id in (?)", clusterless, jobCluster)
+			Where("id in (?)", jobCluster)
 	}
 
 	// Find the workers NOT blocked.
diff --git a/internal/manager/persistence/jobs_blocklist_test.go b/internal/manager/persistence/jobs_blocklist_test.go
index 97e28e39..97e3503d 100644
--- a/internal/manager/persistence/jobs_blocklist_test.go
+++ b/internal/manager/persistence/jobs_blocklist_test.go
@@ -126,6 +126,16 @@ func TestWorkersLeftToRun(t *testing.T) {
 	worker1 := createWorker(ctx, t, db)
 	worker2 := createWorkerFrom(ctx, t, db, *worker1)
 
+	// Create one worker cluster. It will not be used by this job, but one of the
+	// workers will be assigned to it. It can get this job's tasks, though.
+	// Because the job is clusterless, it can be run by all.
+	cluster1 := WorkerCluster{UUID: "11157623-4b14-4801-bee2-271dddab6309", Name: "Cluster 1"}
+	require.NoError(t, db.CreateWorkerCluster(ctx, &cluster1))
+	workerC1 := createWorker(ctx, t, db, func(w *Worker) {
+		w.UUID = "c1c1c1c1-0000-1111-2222-333333333333"
+		w.Clusters = []*WorkerCluster{&cluster1}
+	})
+
 	uuidMap := func(workers ...*Worker) map[string]bool {
 		theMap := map[string]bool{}
 		for _, worker := range workers {
@@ -134,21 +144,22 @@ func TestWorkersLeftToRun(t *testing.T) {
 		return theMap
 	}
 
-	// Two workers, no blocklist.
+	// Three workers, no blocklist.
 	left, err = db.WorkersLeftToRun(ctx, job, "blender")
 	if assert.NoError(t, err) {
-		assert.Equal(t, uuidMap(worker1, worker2), left)
+		assert.Equal(t, uuidMap(worker1, worker2, workerC1), left)
 	}
 
 	// Two workers, one blocked.
 	_ = db.AddWorkerToJobBlocklist(ctx, job, worker1, "blender")
 	left, err = db.WorkersLeftToRun(ctx, job, "blender")
 	if assert.NoError(t, err) {
-		assert.Equal(t, uuidMap(worker2), left)
+		assert.Equal(t, uuidMap(worker2, workerC1), left)
 	}
 
-	// Two workers, both blocked.
+	// All workers blocked.
 	_ = db.AddWorkerToJobBlocklist(ctx, job, worker2, "blender")
+	_ = db.AddWorkerToJobBlocklist(ctx, job, workerC1, "blender")
 	left, err = db.WorkersLeftToRun(ctx, job, "blender")
 	assert.NoError(t, err)
 	assert.Empty(t, left)
@@ -157,7 +168,7 @@ func TestWorkersLeftToRun(t *testing.T) {
 	fakeJob := Job{Model: Model{ID: 327}}
 	left, err = db.WorkersLeftToRun(ctx, &fakeJob, "blender")
 	if assert.NoError(t, err) {
-		assert.Equal(t, uuidMap(worker1, worker2), left)
+		assert.Equal(t, uuidMap(worker1, worker2, workerC1), left)
 	}
 }
 
@@ -193,8 +204,9 @@ func TestWorkersLeftToRunWithClusters(t *testing.T) {
 		w.UUID = "c2c2c2c2-0000-1111-2222-333333333333"
 		w.Clusters = []*WorkerCluster{&cluster2}
 	})
-	// No clusters, so should be able to run all.
-	workerCNone := createWorker(ctx, t, db, func(w *Worker) {
+	// No clusters, so should be able to run only clusterless jobs. Which is none
+	// in this test.
+	createWorker(ctx, t, db, func(w *Worker) {
 		w.UUID = "00000000-0000-1111-2222-333333333333"
 		w.Clusters = nil
 	})
@@ -207,20 +219,19 @@ func TestWorkersLeftToRunWithClusters(t *testing.T) {
 		return theMap
 	}
 
-	// All Cluster 1 workers + clusterless worker, no blocklist.
+	// All Cluster 1 workers, no blocklist.
 	left, err := db.WorkersLeftToRun(ctx, job, "blender")
 	require.NoError(t, err)
-	assert.Equal(t, uuidMap(workerC13, workerC1, workerCNone), left)
+	assert.Equal(t, uuidMap(workerC13, workerC1), left)
 
-	// One worker blocked, two workers remain.
+	// One worker blocked, one worker remain.
 	_ = db.AddWorkerToJobBlocklist(ctx, job, workerC1, "blender")
 	left, err = db.WorkersLeftToRun(ctx, job, "blender")
 	require.NoError(t, err)
-	assert.Equal(t, uuidMap(workerC13, workerCNone), left)
+	assert.Equal(t, uuidMap(workerC13), left)
 
-	// All workers blocked.
+	// All clustered workers blocked.
 	_ = db.AddWorkerToJobBlocklist(ctx, job, workerC13, "blender")
-	_ = db.AddWorkerToJobBlocklist(ctx, job, workerCNone, "blender")
 	left, err = db.WorkersLeftToRun(ctx, job, "blender")
 	assert.NoError(t, err)
 	assert.Empty(t, left)