diff --git a/synchronizer/synchronizer.go b/synchronizer/synchronizer.go
index 3f7b2bb..077ee35 100644
--- a/synchronizer/synchronizer.go
+++ b/synchronizer/synchronizer.go
@@ -1080,7 +1080,7 @@ func (s *Synchronizer) auctionSync(ethBlock *common.Block) (*common.AuctionData,
 		}
 		s.vars.Auction.DefaultSlotSetBid[evt.SlotSet] = evt.NewInitialMinBid
 		s.vars.Auction.DefaultSlotSetBidSlotNum = s.consts.Auction.SlotNum(blockNum) +
-			int64(s.vars.Auction.ClosedAuctionSlots) + 1
+			int64(s.vars.Auction.ClosedAuctionSlots)
 		varsUpdate = true
 	}
 
diff --git a/test/ethclient.go b/test/ethclient.go
index b6185e8..bc8ee83 100644
--- a/test/ethclient.go
+++ b/test/ethclient.go
@@ -1429,11 +1429,11 @@ func (c *Client) AuctionBid(amount *big.Int, slot int64, bidAmount *big.Int,
 	nextBlock := c.nextBlock()
 	a := nextBlock.Auction
 
-	if slot < a.getCurrentSlotNumber()+int64(a.Vars.ClosedAuctionSlots) {
+	if slot <= a.getCurrentSlotNumber()+int64(a.Vars.ClosedAuctionSlots) {
 		return nil, tracerr.Wrap(errBidClosed)
 	}
 
-	if slot >= a.getCurrentSlotNumber()+int64(a.Vars.ClosedAuctionSlots)+int64(a.Vars.OpenAuctionSlots) {
+	if slot > a.getCurrentSlotNumber()+int64(a.Vars.ClosedAuctionSlots)+int64(a.Vars.OpenAuctionSlots) {
 		return nil, tracerr.Wrap(errBidNotOpen)
 	}