diff --git a/packages/dai-plugin-mcd/typings/multicall.d.ts b/packages/dai-plugin-mcd/typings/multicall.d.ts
index b9b015389..cbb5c5114 100644
--- a/packages/dai-plugin-mcd/typings/multicall.d.ts
+++ b/packages/dai-plugin-mcd/typings/multicall.d.ts
@@ -1,6 +1,7 @@
 declare global {
   interface Currency {}
   interface CurrencyRatio {}
+  interface BigNumber {}
   interface VaultResult {
      /**
      * The id of this vault.