diff --git a/src/services/lite/utils.ts b/src/services/lite/utils.ts
index 7f3126fa..6cf87354 100644
--- a/src/services/lite/utils.ts
+++ b/src/services/lite/utils.ts
@@ -118,7 +118,7 @@ export const calculateXTZTotal = (choices: Choice[] | undefined) => {
   if (choices) {
     choices.map((choice: Choice) => {
       totalXTZ = choice.walletAddresses.reduce(
-        (total: number, walletAddress: WalletAddress) => total + walletAddress.balanceAtReferenceBlock,
+        (total: number, walletAddress: WalletAddress) => total + new BigNumber(walletAddress.balanceAtReferenceBlock),
         0
       )
     })