diff --git a/product/ERP5Type/tests/ERP5TypeLiveTestCase.py b/product/ERP5Type/tests/ERP5TypeLiveTestCase.py
index 1fa75c0f396135b3e5a0d6ae1cf09b466ac11c60..e567b999a5c5662aec1015477380457a89add068 100644
--- a/product/ERP5Type/tests/ERP5TypeLiveTestCase.py
+++ b/product/ERP5Type/tests/ERP5TypeLiveTestCase.py
@@ -230,6 +230,7 @@ def runLiveTest(test_list, verbosity=1, stream=None, request_server_url=None, **
     output = StringIO()
   def print_and_write(data):
     sys.stdout.write(data)
+    sys.stdout.flush()
     return StringIO.write(output, data)
   output.write = print_and_write
   output.write("**Running Live Test:\n")