diff --git a/synchronizer/synchronizer.go b/synchronizer/synchronizer.go
index 01158aa..f3475e0 100644
--- a/synchronizer/synchronizer.go
+++ b/synchronizer/synchronizer.go
@@ -114,7 +114,7 @@ type SynchronizerReorgSupporter interface {
 	SetCallbackOnReorgDone(callback func(reorgData ReorgExecutionResult))
 }
 
-type rollbackBatchesData struct {
+type RollbackBatchesData struct {
 	LastBatchNumber       uint64
 	LastBatchAccInputHash common.Hash
 }
@@ -123,7 +123,7 @@ type rollbackBatchesData struct {
 type SynchronizerRollbackBatchesSupporter interface {
 	// SetCallbackOnRollbackBatches sets a callback that will be called when the rollbackBatches  is done
 	// to disable it you can set nil
-	SetCallbackOnRollbackBatches(callback func(data rollbackBatchesData))
+	SetCallbackOnRollbackBatches(callback func(data RollbackBatchesData))
 }
 
 type Synchronizer interface {
diff --git a/synchronizer/synchronizer_adapter.go b/synchronizer/synchronizer_adapter.go
index b3654f8..7875b52 100644
--- a/synchronizer/synchronizer_adapter.go
+++ b/synchronizer/synchronizer_adapter.go
@@ -24,7 +24,9 @@ func (s *SynchronizerAdapter) SetCallbackOnReorgDone(callback func(reorgData Reo
 				ReasonError:                       nreorgData.ReasonError,
 			})
 		})
+}
 
+func (s *SynchronizerAdapter) SetCallbackOnRollbackBatches(callback func(data RollbackBatchesData)) {
 }
 
 func (s *SynchronizerAdapter) Sync(returnOnSync bool) error {