diff --git a/EDMarketConnector.py b/EDMarketConnector.py
index a7455a43..5d4c234f 100755
--- a/EDMarketConnector.py
+++ b/EDMarketConnector.py
@@ -801,7 +801,7 @@ if __name__ == "__main__":
     if getattr(sys, 'frozen', False):
         # By default py2exe tries to write log to dirname(sys.executable) which fails when installed
         import tempfile
-        sys.stdout = sys.stderr = open(join(tempfile.gettempdir(), '%s.log' % appname), 'wt', 0)	# unbuffered
+        sys.stdout = sys.stderr = open(join(tempfile.gettempdir(), '%s.log' % appname), 'wt', 1)	# unbuffered not allowed for text in python3, so use line buffering
         print('%s %s %s' % (applongname, appversion, strftime('%Y-%m-%dT%H:%M:%S', localtime())))
 
     Translations.install(config.get('language') or None)	# Can generate errors so wait til log set up