diff --git a/config.go b/config.go
index 4a42c3b..573c74c 100644
--- a/config.go
+++ b/config.go
@@ -18,6 +18,7 @@ func readConfig() (*config, error) {
 	if err != nil {
 		return nil, err
 	}
+	defer open.Close()
 
 	d := yaml.NewDecoder(open)
 	d.KnownFields(true)