diff --git a/test/ruby/test_string.rb b/test/ruby/test_string.rb
index 149c128ed40bbf..8b70bbb46db7ca 100644
--- a/test/ruby/test_string.rb
+++ b/test/ruby/test_string.rb
@@ -1130,6 +1130,11 @@ def test_grapheme_clusters_memory_leak
     end;
   end
 
+  def test_byteslice_grapheme_clusters
+    string = "안녕"
+    assert_equal(["안"], string.byteslice(0,4).grapheme_clusters)
+  end
+
   def test_each_line
     verbose, $VERBOSE = $VERBOSE, nil