diff --git a/pool.go b/pool.go
index 656bf19..7a7a48e 100644
--- a/pool.go
+++ b/pool.go
@@ -67,7 +67,7 @@ func (p *Pool) periodicallyPurge() {
 			p.lock.Unlock()
 			return
 		}
-		n := 0
+		n := -1
 		for i, w := range idleWorkers {
 			if currentTime.Sub(w.recycleTime) <= p.expiryDuration {
 				break
@@ -76,12 +76,11 @@ func (p *Pool) periodicallyPurge() {
 			w.task <- nil
 			idleWorkers[i] = nil
 		}
-		n++
-		if n > 0 {
+		if n > -1 {
 			if n >= len(idleWorkers) {
 				p.workers = idleWorkers[:0]
 			} else {
-				p.workers = idleWorkers[n:]
+				p.workers = idleWorkers[n+1:]
 			}
 		}
 		p.lock.Unlock()
diff --git a/pool_func.go b/pool_func.go
index 0b2eed5..7c0df59 100644
--- a/pool_func.go
+++ b/pool_func.go
@@ -68,7 +68,7 @@ func (p *PoolWithFunc) periodicallyPurge() {
 			p.lock.Unlock()
 			return
 		}
-		n := 0
+		n := -1
 		for i, w := range idleWorkers {
 			if currentTime.Sub(w.recycleTime) <= p.expiryDuration {
 				break
@@ -77,12 +77,11 @@ func (p *PoolWithFunc) periodicallyPurge() {
 			w.args <- nil
 			idleWorkers[i] = nil
 		}
-		n++
-		if n > 0 {
+		if n > -1 {
 			if n >= len(idleWorkers) {
 				p.workers = idleWorkers[:0]
 			} else {
-				p.workers = idleWorkers[n:]
+				p.workers = idleWorkers[n+1:]
 			}
 		}
 		p.lock.Unlock()