diff --git a/bitbake/lib/bb/utils.py b/bitbake/lib/bb/utils.py
index 068b631c94..ad13d04331 100644
--- a/bitbake/lib/bb/utils.py
+++ b/bitbake/lib/bb/utils.py
@@ -604,7 +604,6 @@ def preserved_envvars():
     v = [
         'BBPATH',
         'BB_PRESERVE_ENV',
-        'BB_ENV_PASSTHROUGH',
         'BB_ENV_PASSTHROUGH_ADDITIONS',
     ]
     return v + preserved_envvars_exported()