diff --git a/gparser/sitemap.go b/gparser/sitemap.go
index 83af8db..f07aa98 100644
--- a/gparser/sitemap.go
+++ b/gparser/sitemap.go
@@ -16,7 +16,7 @@ type urlset struct {
 
 type URL struct {
     Location    string          `xml:"loc"`
-    LastMod     time.Time       `xml:"lastmod"`
+    LastMod     time.Time       `xml:"lastmod,omitempty"`
     ChangeFreq  string          `xml:"changefreq"`
     Priority    float32         `xml:"priority"`
 }