diff --git a/ruby/red-arrow-format/lib/arrow-format/integration/json-reader.rb b/ruby/red-arrow-format/lib/arrow-format/integration/json-reader.rb
index 3660e8af3427..162f36fb68ce 100644
--- a/ruby/red-arrow-format/lib/arrow-format/integration/json-reader.rb
+++ b/ruby/red-arrow-format/lib/arrow-format/integration/json-reader.rb
@@ -384,7 +384,8 @@ def read_array(column, type)
         when DictionaryType
           validity_buffer = read_bitmap(column["VALIDITY"])
           indices_buffer = read_values(column["DATA"], type.index_type)
-          dictionary = read_dictionary(type.id, type.value_type)
+          dictionary_array = read_dictionary(type.id, type.value_type)
+          dictionary = Dictionary.new(type.id, dictionary_array)
           type.build_array(length,
                            validity_buffer,
                            indices_buffer,