diff --git a/gzippool.go b/gzippool.go
index 1390ac0f..dacc65d4 100644
--- a/gzippool.go
+++ b/gzippool.go
@@ -59,5 +59,7 @@ func (p *gzipPool) Put(gz *gzip.Writer) {
 	p.mutex.Lock()
 	defer p.mutex.Unlock()
 
+	gz.Reset(ioutil.Discard)
+
 	p.top = &gzipPoolEntry{gz: gz, next: p.top}
 }