diff --git a/pool.go b/pool.go
index 4e93a36..5a13182 100644
--- a/pool.go
+++ b/pool.go
@@ -75,8 +75,8 @@ func (p *Pool) periodicallyPurge() {
 			w.task <- nil
 			idleWorkers[i] = nil
 		}
+		n++
 		if n > 0 {
-			n++
 			p.workers = idleWorkers[n:]
 		}
 		p.lock.Unlock()
diff --git a/pool_func.go b/pool_func.go
index 944a6ba..ee23b9e 100644
--- a/pool_func.go
+++ b/pool_func.go
@@ -77,8 +77,8 @@ func (p *PoolWithFunc) periodicallyPurge() {
 			w.args <- nil
 			idleWorkers[i] = nil
 		}
+		n++
 		if n > 0 {
-			n++
 			p.workers = idleWorkers[n:]
 		}
 		p.lock.Unlock()