diff --git a/pool.go b/pool.go
index e7836e5..53471e2 100644
--- a/pool.go
+++ b/pool.go
@@ -148,6 +148,7 @@ func (p *Pool) Release() error {
 		for i := range p.workers {
 			p.workers[i] = nil
 		}
+		p.workers = nil
 	})
 	return nil
 }
diff --git a/pool_func.go b/pool_func.go
index 407651a..d99269f 100644
--- a/pool_func.go
+++ b/pool_func.go
@@ -153,6 +153,7 @@ func (p *PoolWithFunc) Release() error {
 		for i := range p.workers {
 			p.workers[i] = nil
 		}
+		p.workers = nil
 	})
 	return nil
 }