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-rw-r--r--python/mach_bootstrap.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/python/mach_bootstrap.py b/python/mach_bootstrap.py
index f94f2c6f772..ec506c881a6 100644
--- a/python/mach_bootstrap.py
+++ b/python/mach_bootstrap.py
@@ -166,7 +166,7 @@ def _activate_virtualenv(topdir, is_firefox):
# We want to upgrade pip when virtualenv created for the first time
need_pip_upgrade = True
- execfile(activate_path, dict(__file__=activate_path))
+ exec(compile(open(activate_path).read(), activate_path, 'exec'), dict(__file__=activate_path))
python = _get_exec_path(PYTHON_NAMES, is_valid_path=check_exec_path)
if not python: