diff --git a/zk/stages/stage_batches_processor.go b/zk/stages/stage_batches_processor.go
index 35da1b5658c..ab08d459c83 100644
--- a/zk/stages/stage_batches_processor.go
+++ b/zk/stages/stage_batches_processor.go
@@ -284,10 +284,10 @@ func (p *BatchesProcessor) processFullBlock(blockEntry *types.FullL2Block) (rest
 	// unwind if we already have this block - could be a re-sequence event
 	if blockEntry.L2BlockNumber < p.lastBlockHeight+1 {
 		log.Warn(fmt.Sprintf("[%s] Skipping block %d, already processed, triggering unwind...", p.logPrefix, blockEntry.L2BlockNumber))
-		if err = p.unwindFn(blockEntry.L2BlockNumber); err != nil {
+		if err = p.unwindFn(blockEntry.L2BlockNumber - 1); err != nil {
 			return 0, false, false, err
 		}
-		return blockEntry.L2BlockNumber, false, true, nil
+		return blockEntry.L2BlockNumber - 1, false, true, nil
 	}
 
 	// check for sequential block numbers