diff --git a/packages/taler-wallet-webextension/src/wallet/Transaction.tsx b/packages/taler-wallet-webextension/src/wallet/Transaction.tsx
index 397972636..c9e7bbe85 100644
--- a/packages/taler-wallet-webextension/src/wallet/Transaction.tsx
+++ b/packages/taler-wallet-webextension/src/wallet/Transaction.tsx
@@ -1285,7 +1285,7 @@ export function InvoiceDetails({ amount }: { amount: AmountWithFee }): VNode {
 export function TransferDetails({ amount }: { amount: AmountWithFee }): VNode {
   const { i18n } = useTranslationContext();
 
-  const fee = Amounts.sub(amount.raw, amount.effective).amount;
+  const fee = Amounts.sub(amount.effective, amount.raw).amount;
 
   const maxFrac = [amount.raw, amount.effective, fee]
     .map((a) => Amounts.maxFractionalDigits(a))