diff --git a/pkg/fsutil/file.go b/pkg/fsutil/file.go
index 918c45d89..0c0eb5271 100644
--- a/pkg/fsutil/file.go
+++ b/pkg/fsutil/file.go
@@ -20,7 +20,7 @@ func CopyFile(srcpath, dstpath string) (err error) {
 		return err
 	}
 
-	w, err := os.OpenFile(dstpath, os.O_CREATE|os.O_EXCL, 0666)
+	w, err := os.OpenFile(dstpath, os.O_CREATE|os.O_WRONLY|os.O_EXCL, 0666)
 	if err != nil {
 		r.Close() // We need to close the input file as the defer below would not be called.
 		return err