diff --git a/test/reline/test_line_editor.rb b/test/reline/test_line_editor.rb
index cc4dc6d29a..3ed3fa956f 100644
--- a/test/reline/test_line_editor.rb
+++ b/test/reline/test_line_editor.rb
@@ -8,7 +8,7 @@ class CompletionBlockTest < Reline::TestCase
     def setup
       @original_quote_characters = Reline.completer_quote_characters
       @original_word_break_characters = Reline.completer_word_break_characters
-      @line_editor = Reline::LineEditor.new(nil, Encoding::UTF_8)
+      @line_editor = Reline::LineEditor.new(nil)
     end
 
     def retrieve_completion_block(lines, line_index, byte_pointer)