diff --git a/src/actions/WalletActions.js b/src/actions/WalletActions.js
index f8d8765f..98037319 100644
--- a/src/actions/WalletActions.js
+++ b/src/actions/WalletActions.js
@@ -23,7 +23,7 @@ export type WalletAction =
     | {
           type: typeof WALLET.SET_INITIAL_URL,
           state?: RouterLocationState,
-          pathname?: string,
+          pathname?: ?string,
       }
     | {
           type: typeof WALLET.TOGGLE_DEVICE_DROPDOWN,