diff --git a/internal/third/ants/ants.go b/internal/third/ants/ants.go
index 8deeb5b..ad0d24f 100644
--- a/internal/third/ants/ants.go
+++ b/internal/third/ants/ants.go
@@ -122,7 +122,7 @@ type (
 	// Envelope is the underlying wrapper used for func based (with input)
 	// worker pools.
 	Envelope struct {
-		ID    RoutineID
+		id    RoutineID
 		Input any
 		state any
 	}
@@ -130,13 +130,13 @@ type (
 	// TaskEnvelope is the underlying wrapper used for task based
 	// worker pools.
 	TaskEnvelope struct {
-		ID   RoutineID
+		id   RoutineID
 		Task TaskFunc
 	}
 )
 
 func (e Envelope) WorkerID() RoutineID {
-	return e.ID
+	return e.id
 }
 
 func (e Envelope) Param() InputParam {
@@ -148,7 +148,7 @@ func (e Envelope) State() any {
 }
 
 func (e TaskEnvelope) WorkerID() RoutineID {
-	return e.ID
+	return e.id
 }
 
 func (e TaskEnvelope) Func() TaskFunc {
diff --git a/internal/third/ants/worker-func.go b/internal/third/ants/worker-func.go
index b5fc6c8..ac4c9fb 100644
--- a/internal/third/ants/worker-func.go
+++ b/internal/third/ants/worker-func.go
@@ -113,7 +113,7 @@ func (w *goWorkerWithFunc) sendParam(ctx context.Context, job InputParam) {
 	select {
 	case <-ctx.Done():
 	case w.inputCh <- &Envelope{
-		ID:    w.id,
+		id:    w.id,
 		Input: job,
 	}:
 	}
diff --git a/internal/third/ants/worker.go b/internal/third/ants/worker.go
index 859ac5a..be97d7b 100644
--- a/internal/third/ants/worker.go
+++ b/internal/third/ants/worker.go
@@ -92,7 +92,7 @@ func (w *goWorker) sendTask(ctx context.Context, fn TaskFunc) {
 	select {
 	case <-ctx.Done():
 	case w.taskCh <- &TaskEnvelope{
-		ID:   w.id,
+		id:   w.id,
 		Task: fn,
 	}:
 	}