diff --git a/readme.md b/readme.md
index b2cae4a..33711b6 100644
--- a/readme.md
+++ b/readme.md
@@ -28,7 +28,7 @@ import(
 func main() {
 		m := new(ddbsync.Mutex)
 		m.Name = "some-name"
-		m.Ttl = 10 * time.Second
+		m.Ttl = int64(10 * time.Second)
 		m.Lock()
 		defer m.Unlock()
 		// do important work here