diff --git a/gin.go b/gin.go
index 1965a429..38361a4b 100644
--- a/gin.go
+++ b/gin.go
@@ -593,6 +593,7 @@ func (engine *Engine) RunFd(fd int) (err error) {
 	}
 
 	f := os.NewFile(uintptr(fd), fmt.Sprintf("fd@%d", fd))
+	defer f.Close()
 	listener, err := net.FileListener(f)
 	if err != nil {
 		return