diff --git a/test/helper.rb b/test/helper.rb
index 8992caa05..537d7e3a2 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -1,5 +1,7 @@
 # frozen_string_literal: true
-$:.unshift File.expand_path("../../lib", __FILE__)
+
+lib = File.expand_path("../../lib", __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 
 begin
   if ENV["COVERALLS"]