diff --git a/tools/cef_version.py b/tools/cef_version.py
index 80bbf651b..d63dc763f 100644
--- a/tools/cef_version.py
+++ b/tools/cef_version.py
@@ -24,7 +24,7 @@ class VersionFormatter:
 
     # Whether to use the old version format by default.
     self._old_format_default = \
-        bool(int(os.environ.get('CEF_OLD_VERSION_FORMAT', '1')))
+        bool(int(os.environ.get('CEF_OLD_VERSION_FORMAT', '0')))
 
     self.reset()