diff --git a/src/js/controllers/buyAmazon.js b/src/js/controllers/buyAmazon.js
index 18d52e7d9..b063126cc 100644
--- a/src/js/controllers/buyAmazon.js
+++ b/src/js/controllers/buyAmazon.js
@@ -139,7 +139,7 @@ angular.module('copayApp.controllers').controller('buyAmazonController', functio
 
     var outputs = [];
     var toAddress = invoice.bitcoinAddress;
-    var amountSat = parseInt(invoice.btcDue * 100000000); // BTC to Satoshi
+    var amountSat = parseInt((invoice.btcDue * 100000000).toFixed(0)); // BTC to Satoshi
 
     outputs.push({
       'toAddress': toAddress,
diff --git a/src/js/controllers/topup.js b/src/js/controllers/topup.js
index 3a505e729..3c66830b1 100644
--- a/src/js/controllers/topup.js
+++ b/src/js/controllers/topup.js
@@ -117,7 +117,7 @@ angular.module('copayApp.controllers').controller('topUpController', function($s
 
     var outputs = [];
     var toAddress = invoice.bitcoinAddress;
-    var amountSat = parseInt(invoice.btcDue * 100000000); // BTC to Satoshi
+    var amountSat = parseInt((invoice.btcDue * 100000000).toFixed(0)); // BTC to Satoshi
 
     outputs.push({
       'toAddress': toAddress,