diff --git a/EDMarketConnector.py b/EDMarketConnector.py
index 71778ef6..81d22747 100755
--- a/EDMarketConnector.py
+++ b/EDMarketConnector.py
@@ -441,7 +441,7 @@ class AppWindow(object):
 
                 if __debug__:	# Recording
                     if isdir('dump'):
-                        with open('dump/%s%s.%s.json' % (data['lastSystem']['name'], data['commander'].get('docked') and '.'+data['lastStarport']['name'] or '', strftime('%Y-%m-%dT%H.%M.%S', localtime())), 'wt') as h:
+                        with open('dump/%s%s.%s.json' % (data['lastSystem']['name'], data['commander'].get('docked') and '.'+data['lastStarport']['name'] or '', strftime('%Y-%m-%dT%H.%M.%S', localtime())), 'wb') as h:
                             h.write(json.dumps(data, ensure_ascii=False, indent=2, sort_keys=True, separators=(',', ': ')).encode('utf-8'))
 
                 if not monitor.state['ShipType']:	# Started game in SRV or fighter