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-rw-r--r--test/ruby/test_system.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/ruby/test_system.rb b/test/ruby/test_system.rb
index ed7f8b8fd1..d756e4a2d5 100644
--- a/test/ruby/test_system.rb
+++ b/test/ruby/test_system.rb
@@ -1,5 +1,5 @@
require 'test/unit'
-$:.unshift(File.dirname(File.expand_path(__FILE__)))
+$:.replace([File.dirname(File.expand_path(__FILE__))] | $:)
require 'envutil'
$KCODE = 'none'