diff --git a/lib/hotwire_combobox/helper.rb b/lib/hotwire_combobox/helper.rb
index 6eb7d9f..5f7ce04 100644
--- a/lib/hotwire_combobox/helper.rb
+++ b/lib/hotwire_combobox/helper.rb
@@ -115,8 +115,8 @@ def hw_first_page?
 
       def hw_uri_with_params(url_or_path, **params)
         URI.parse(url_or_path).tap do |url_or_path|
-          query = URI.decode_www_form(url_or_path.query || "").to_h.merge(params.compact_blank.stringify_keys)
-          url_or_path.query = URI.encode_www_form query
+          query = Rack::Utils.parse_nested_query(url_or_path.query || "").merge(params.compact_blank.stringify_keys)
+          url_or_path.query = Rack::Utils.build_nested_query query
         end.to_s
       rescue URI::InvalidURIError
         url_or_path
diff --git a/test/helpers/hotwire_combobox/helper_test.rb b/test/helpers/hotwire_combobox/helper_test.rb
index 2720181..64c9197 100644
--- a/test/helpers/hotwire_combobox/helper_test.rb
+++ b/test/helpers/hotwire_combobox/helper_test.rb
@@ -138,6 +138,15 @@ class HotwireCombobox::HelperTest < ApplicationViewTestCase
     assert_attrs html, tag_name: "turbo-frame", src: "/foo?bar=baz&qux=quux&page=2&format=turbo_stream"
   end
 
+  test "hw_paginated_combobox_options includes array params" do
+    request.expects(:path).returns("/foo")
+    request.expects(:query_parameters).returns({ ary: [ 1, 2 ] }.with_indifferent_access)
+
+    html = hw_paginated_combobox_options [], next_page: 2
+
+    assert_attrs CGI.unescape(html), tag_name: "turbo-frame", src: "/foo?ary[]=1&ary[]=2&page=2&format=turbo_stream"
+  end
+
   test "single repeating character values" do
     form = form_with model: OpenStruct.new(run_at: "* * * * *", persisted?: true, model_name: OpenStruct.new(param_key: :foo)), url: "#" do |form|
       form.combobox :run_at, [ "@hourly", "@daily", "@weekly", "@monthly", "@every 4h", "0 12 * * *" ], free_text: true