diff --git a/src/calibre/test_build.py b/src/calibre/test_build.py
index 509e6fc357..289b1bb92a 100644
--- a/src/calibre/test_build.py
+++ b/src/calibre/test_build.py
@@ -9,7 +9,7 @@ __docformat__ = 'restructuredtext en'
 Test a binary calibre build to ensure that all needed binary images/libraries have loaded.
 '''
 
-import os, ctypes, sys, unittest, time, shutil
+import os, ctypes, sys, unittest, time, shutil, builtins
 
 from calibre.constants import iswindows, islinux, ismacos, plugins_loc
 from polyglot.builtins import iteritems
@@ -18,6 +18,10 @@ is_ci = os.environ.get('CI', '').lower() == 'true'
 is_sanitized = 'libasan' in os.environ.get('LD_PRELOAD', '')
 
 
+def print(*a):
+    builtins.print(*a, flush=True, file=sys.__stdout__)
+
+
 class BuildTest(unittest.TestCase):
 
     @unittest.skipUnless(iswindows and not is_ci, 'DLL loading needs testing only on windows (non-continuous integration)')