diff --git a/webapp/models/Staking.php b/webapp/models/Staking.php
index 2ff7a44f..4a5350c4 100644
--- a/webapp/models/Staking.php
+++ b/webapp/models/Staking.php
@@ -246,7 +246,7 @@ class Staking extends BaseModel {
         return 1;
     }
 
-    public static function getDailyInterest($stakeTime)
+    private static function getDailyInterest($stakeTime)
     {
         $months = intval($stakeTime / 3600 / 24 / 30);
         if ($months <= 0) {