diff --git a/pkg/debug-agent/lxcfs.go b/pkg/debug-agent/lxcfs.go
index c2381f8..9a63269 100644
--- a/pkg/debug-agent/lxcfs.go
+++ b/pkg/debug-agent/lxcfs.go
@@ -40,6 +40,7 @@ func CheckLxcfsMount() error {
 	if err != nil {
 		return fmt.Errorf("Check lxcfs mounts failed: %v", err)
 	}
+	defer f.Close()
 	fr := bufio.NewReader(f)
 	for {
 		line, err := fr.ReadBytes('\n')