diff --git a/src/checkable.ts b/src/checkable.ts
index 2255209f1..a8cc38221 100644
--- a/src/checkable.ts
+++ b/src/checkable.ts
@@ -157,6 +157,7 @@ export namespace Checkable {
       const value = target[key];
       prop.valueProp.checker(value, prop.valueProp, path.concat([key]));
     }
+    return target;
   }
 
 
diff --git a/src/wallet.ts b/src/wallet.ts
index f5a1bd43c..4c7e8c181 100644
--- a/src/wallet.ts
+++ b/src/wallet.ts
@@ -1337,7 +1337,8 @@ export class Wallet {
     if (!wiJson) {
       throw Error("/wire response malformed");
     }
-    return ExchangeWireJson.checked(wiJson)
+
+    return ExchangeWireJson.checked(wiJson);
   }
 
 
@@ -1614,6 +1615,8 @@ export class Wallet {
       throw Error("exchange doesn't offer any denominations");
     }
 
+    console.log("updating exchange with wireMethodDetails", wireMethodDetails);
+
     const r = await this.q().get<ExchangeRecord>(Stores.exchanges, baseUrl);
 
     let exchangeInfo: ExchangeRecord;