diff --git a/lib/gui_qt.py b/lib/gui_qt.py
index 6a7002b68..c776f024b 100644
--- a/lib/gui_qt.py
+++ b/lib/gui_qt.py
@@ -928,7 +928,7 @@ class ElectrumWindow(QMainWindow):
             filename = 'unsigned_tx'
             f = open(filename,'w')
             import json
-            out = json.dumps({"hex":str(tx), "complete":tx.is_complete, 'input_info':repr(tx.input_info).replace(' ','')})
+            out = json.dumps({"hex":str(tx), "complete":tx.is_complete, 'input_info':repr(tx.input_info).replace(' ','')}, indent=4)
             f.write(out + '\n')
             f.close()
             QMessageBox.information(self, _('Unsigned transaction'), _("Unsigned transaction was saved to file:") + " " +filename, _('OK'))