diff --git a/hwe/sammo/Auction.php b/hwe/sammo/Auction.php
index 349855f8..07bbf5e1 100644
--- a/hwe/sammo/Auction.php
+++ b/hwe/sammo/Auction.php
@@ -281,8 +281,8 @@ abstract class Auction
     $general = $this->general;
 
     $highestBid = $this->getHighestBid();
-    if ($highestBid !== null && $amount <= $highestBid->amount) {
-      return '현재입찰가보다 높게 입찰해야 합니다.';
+    if ($highestBid !== null && $amount < $highestBid->amount + 10) {
+      return '현재입찰가보다 10 포인트 높게 입찰해야 합니다.';
     }
 
     $myPrevBid = $this->getMyPrevBid();