diff --git a/dyndns/handler/log.go b/dyndns/handler/log.go
index 22c1a54..569c110 100644
--- a/dyndns/handler/log.go
+++ b/dyndns/handler/log.go
@@ -59,8 +59,8 @@ func (h *Handler) ShowHostLogs(c echo.Context) (err error) {
 }
 
 func (h *Handler) ClearLogs() {
-	var clearInterval = strconv.FormatUint(h.ClearInterval, 10) + " days"
-	h.DB.Exec("DELETE FROM LOGS WHERE created_at < datetime('now', '" + clearInterval + "');REINDEX LOGS;")
+	var clearInterval = strconv.FormatUint(h.ClearInterval, 10) + " day"
+	h.DB.Exec("DELETE FROM LOGS WHERE created_at < datetime('now', '-" + clearInterval + "');REINDEX LOGS;")
 	h.LastClearedLogs = time.Now()
 	log.Print("logs cleared")
 }