diff --git a/openerp/tests/common.py b/openerp/tests/common.py
index f058436ad33..c23c9974a83 100644
--- a/openerp/tests/common.py
+++ b/openerp/tests/common.py
@@ -290,7 +290,7 @@ class HttpCase(TransactionCase):
             _logger.info('phantomjs unlink localstorage %s', i)
             os.unlink(i)
         try:
-            phantom = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+            phantom = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=None)
         except OSError:
             raise unittest2.SkipTest("PhantomJS not found")
         try: