diff --git a/lib/cash-out/cash-out-tx.js b/lib/cash-out/cash-out-tx.js
index 838971cb..7d98834b 100644
--- a/lib/cash-out/cash-out-tx.js
+++ b/lib/cash-out/cash-out-tx.js
@@ -36,8 +36,8 @@ function selfPost (tx, pi) {
 }
 
 function post (tx, pi, fromClient = true) {
-  logger.silly('Updating cashout -- tx:', tx)
-  logger.silly('Updating cashout -- fromClient:', fromClient)
+  logger.silly('Updating cashout -- tx:', JSON.stringify(tx))
+  logger.silly('Updating cashout -- fromClient:', JSON.stringify(fromClient))
   return cashOutAtomic.atomic(tx, pi, fromClient)
     .then(txVector => {
       const [, newTx, justAuthorized] = txVector
@@ -64,7 +64,7 @@ function postProcess (txVector, justAuthorized, pi) {
           fiat: newTx.fiat
         })
         const bills = billMath.makeChange(cassettes.cassettes, newTx.fiat)
-        logger.silly('Bills to dispense:', bills)
+        logger.silly('Bills to dispense:', JSON.stringify(bills))
 
         if (!bills) throw httpError('Out of bills', INSUFFICIENT_FUNDS_CODE)
         return bills