diff --git a/pool.go b/pool.go
index 986ee20..e27d586 100644
--- a/pool.go
+++ b/pool.go
@@ -244,8 +244,8 @@ func (p *Pool) retrieveWorker() (w *goWorker) {
 		p.cond.Wait()
 		p.blockingNum--
 		if p.Running() == 0 {
+			p.lock.Unlock()
 			if !p.IsClosed() {
-				p.lock.Unlock()
 				spawnWorker()
 			}
 			return
diff --git a/pool_func.go b/pool_func.go
index 4ca2acb..3d77487 100644
--- a/pool_func.go
+++ b/pool_func.go
@@ -262,8 +262,8 @@ func (p *PoolWithFunc) retrieveWorker() (w *goWorkerWithFunc) {
 		p.cond.Wait()
 		p.blockingNum--
 		if p.Running() == 0 {
+			p.lock.Unlock()
 			if !p.IsClosed() {
-				p.lock.Unlock()
 				spawnWorker()
 			}
 			return