diff --git a/providers/os/os.go b/providers/os/os.go
index 2beeead..e652a10 100644
--- a/providers/os/os.go
+++ b/providers/os/os.go
@@ -104,7 +104,7 @@ func (this *state) funcWriteFile (name, content string) error {
 func (this *state) funcAppendFile (name, content string) error {
 	name, err := this.document.Rel(name)
 	if err != nil { return err }
-	file, err := os.OpenFile(name, os.O_CREATE | os.O_WRONLY | os.O_APPEND, 644)
+	file, err := os.OpenFile(name, os.O_CREATE | os.O_WRONLY | os.O_APPEND, 0644)
 	if err != nil { return err }
 	_, err = io.WriteString(file, content)
 	return err