diff --git a/updater.go b/updater.go
index 5118000..b36d1b9 100644
--- a/updater.go
+++ b/updater.go
@@ -87,7 +87,7 @@ func (h *updateHeap) updateTask() {
 		hlen := h.Len()
 		for i := 0; i < hlen; i++ {
 			entry := &h.entries[0]
-			if time.Now().After(entry.ts) {
+			if !time.Now().Before(entry.ts) {
 				interval := entry.s.update()
 				entry.ts = time.Now().Add(interval)
 				heap.Fix(h, 0)