diff --git a/.flowconfig b/.flowconfig
index 6897a28b..9a632b96 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -9,7 +9,7 @@
 .*/node_modules/react-router-redux/.*
 .*/node_modules/oboe/test/.*
 .*/_old/.*
-.*/public/.*
+.*/public/solidity/.*
 
 [libs]
 ./src/flowtype/npm/redux_v3.x.x.js
diff --git a/src/utils/formatUtils.js b/src/utils/formatUtils.js
index 986b0ee9..9009cc7e 100644
--- a/src/utils/formatUtils.js
+++ b/src/utils/formatUtils.js
@@ -3,7 +3,7 @@
 // TODO: chagne currency units
 const currencyUnitsConstant: string = 'mbtc2';
 
-export const formatAmount = (n: number, coinInfo: any, currencyUnits = currencyUnitsConstant): string => {
+export const formatAmount = (n: number, coinInfo: any, currencyUnits: string = currencyUnitsConstant): string => {
     const amount = (n / 1e8);
     if (coinInfo.isBitcoin && currencyUnits === 'mbtc' && amount <= 0.1 && n !== 0) {
         const s = (n / 1e5).toString();