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-rw-r--r--lib/bundler/environment_preserver.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/bundler/environment_preserver.rb b/lib/bundler/environment_preserver.rb
index 444ab6fd37..ffffceb487 100644
--- a/lib/bundler/environment_preserver.rb
+++ b/lib/bundler/environment_preserver.rb
@@ -6,6 +6,7 @@ module Bundler
BUNDLER_KEYS = %w[
BUNDLE_BIN_PATH
BUNDLE_GEMFILE
+ BUNDLER_4_MODE
BUNDLER_VERSION
BUNDLER_SETUP
GEM_HOME