diff --git a/src/components/forms/validator.js b/src/components/forms/validator.js
index 284c90e5..422016f7 100644
--- a/src/components/forms/validator.js
+++ b/src/components/forms/validator.js
@@ -66,7 +66,7 @@ export const mustBeEthereumAddress = simpleMemoize((address: Field) => {
   return isAddress ? undefined : 'Address should be a valid Ethereum address or ENS name'
 })
 
-export const mustBeEthereumContractAddress = simpleMemoize(async (address: Field) => {
+export const mustBeEthereumContractAddress = simpleMemoize(async (address: string) => {
   const contractCode: string = await getWeb3().eth.getCode(address)
 
   return (!contractCode || contractCode.replace('0x', '').replace(/0/g, '') === '')
diff --git a/src/routes/safe/components/Balances/SendModal/index.jsx b/src/routes/safe/components/Balances/SendModal/index.jsx
index ba0f93bb..e87c4416 100644
--- a/src/routes/safe/components/Balances/SendModal/index.jsx
+++ b/src/routes/safe/components/Balances/SendModal/index.jsx
@@ -11,6 +11,8 @@ import ReviewTx from './screens/ReviewTx'
 import SendCustomTx from './screens/SendCustomTx'
 import ReviewCustomTx from './screens/ReviewCustomTx'
 
+type ActiveScreen = 'chooseTxType' | 'sendFunds' | 'reviewTx' | 'sendCustomTx' | 'reviewCustomTx'
+
 type Props = {
   onClose: () => void,
   classes: Object,
@@ -22,11 +24,9 @@ type Props = {
   tokens: List<Token>,
   selectedToken: string,
   createTransaction: Function,
-  activeScreenType: string
+  activeScreenType: ActiveScreen
 }
 
-type ActiveScreen = 'chooseTxType' | 'sendFunds' | 'reviewTx' | 'sendCustomTx' | 'reviewCustomTx'
-
 type TxStateType =
   | {
       token: Token,