diff --git a/accountresolver/processor.go b/accountresolver/processor.go
index ee64e82d..3dc80443 100644
--- a/accountresolver/processor.go
+++ b/accountresolver/processor.go
@@ -144,7 +144,7 @@ type mergeBlocksFile struct {
 func newMergeBlocksFile(fileName string, logger *zap.Logger) *mergeBlocksFile {
 	return &mergeBlocksFile{
 		filename:  fileName,
-		blockChan: make(chan *pbsol.Block),
+		blockChan: make(chan *pbsol.Block, 1),
 		logger:    logger,
 	}
 }