diff --git a/exam_template/python/Python.py b/exam_template/python/Python.py
index 4ea595d..8178507 100644
--- a/exam_template/python/Python.py
+++ b/exam_template/python/Python.py
@@ -7,6 +7,8 @@ from common import replaceContent
 
 def makeTmpFile(content):
   fd, path = tempfile.mkstemp()
+  while ('_' in path):
+    fd, path = tempfile.mkstemp()
   with os.fdopen(fd, 'w') as tmp:
     tmp.write(content)
   return path