diff --git a/google_httpdns.go b/google_httpdns.go
index 1d2b2f3..520d0da 100644
--- a/google_httpdns.go
+++ b/google_httpdns.go
@@ -72,7 +72,7 @@ func (h *GoogleHTTPDns) getMyNet() string {
 	}
 	mask := net.IPv4Mask(255, 255, 255, 0)
 	ipByte := net.ParseIP(ip)
-	ipnet := net.IPNet{ipByte.Mask(mask), mask}
+	ipnet := net.IPNet{IP: ipByte.Mask(mask), Mask: mask}
 	return ipnet.String()
 }