diff --git a/src/mappings/handlers/blockHandlers.ts b/src/mappings/handlers/blockHandlers.ts
index c398b886..225e1a21 100644
--- a/src/mappings/handlers/blockHandlers.ts
+++ b/src/mappings/handlers/blockHandlers.ts
@@ -19,6 +19,7 @@ import {
   TrancheSnapshot,
 } from '../../types/models'
 import { AssetPositionService } from '../services/assetPositionService'
+import { bnToBn } from '@polkadot/util'
 
 const timekeeper = TimekeeperService.init()