diff --git a/test/error_highlight/test_error_highlight.rb b/test/error_highlight/test_error_highlight.rb
index 03909bd593..dcc8ce4eaf 100644
--- a/test/error_highlight/test_error_highlight.rb
+++ b/test/error_highlight/test_error_highlight.rb
@@ -1002,7 +1002,7 @@ undefined method `time' for 1:Integer
   end
 
   def test_hard_tabs
-    tmp = Tempfile.new(["error_highlight_test", ".rb"])
+    tmp = Tempfile.new(["error_highlight_test", ".rb"], binmode: true)
     tmp << "\t \t1.time {}\n"
     tmp.close(false)