diff --git a/vendor/github.com/patrickmn/go-cache/cache.go b/vendor/github.com/patrickmn/go-cache/cache.go
index 5e1a2f2..3777e4d 100644
--- a/vendor/github.com/patrickmn/go-cache/cache.go
+++ b/vendor/github.com/patrickmn/go-cache/cache.go
@@ -53,12 +53,11 @@ func (c *cache) Set(k string, x interface{}, d time.Duration) {
 	var e int64
 	if d == DefaultExpiration {
 		d = c.defaultExpiration
+	} else if d == NoExpiration {
+		e = -1
 	}
 	if d > 0 {
 		e = time.Now().Add(d).UnixNano()
-	} else if d == -1 {
-		e = time.Time{}
-	}
 	c.mu.Lock()
 	c.items[k] = Item{
 		Object:     x,
@@ -73,12 +72,12 @@ func (c *cache) set(k string, x interface{}, d time.Duration) {
 	var e int64
 	if d == DefaultExpiration {
 		d = c.defaultExpiration
+	} else if d == NoExpiration {
+		e = -1
 	}
 	if d > 0 {
 		e = time.Now().Add(d).UnixNano()
-	} else if d == -1  { 
-		e = time.Time{}
-	}
+	} 
 	c.items[k] = Item{
 		Object:     x,
 		Expiration: e,