diff --git a/src/js/amount.js b/src/js/amount.js
index b34018cf16..ee73ea1742 100644
--- a/src/js/amount.js
+++ b/src/js/amount.js
@@ -513,6 +513,7 @@ Amount.prototype.to_human = function (opts)
   }
 
   var formatted = '';
+  if (opts.signed && this._is_negative) formatted += "- ";
   formatted += int_part.length ? int_part : '0';
   formatted += fraction_part.length ? '.'+fraction_part : '';