diff --git a/Gemfile b/Gemfile
index 6ac5785..4ba4089 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 group :development do
diff --git a/bin/pull_translations.rb b/bin/pull_translations.rb
index f2119f3..e8f21bc 100755
--- a/bin/pull_translations.rb
+++ b/bin/pull_translations.rb
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 # Usage:
 #   bundle install
diff --git a/plugin.rb b/plugin.rb
index d8866fd..43b4680 100644
--- a/plugin.rb
+++ b/plugin.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # name: discourse-oauth2-basic
 # about: Generic OAuth2 Plugin
 # version: 0.3
@@ -64,7 +66,7 @@ class OAuth2BasicAuthenticator < ::Auth::OAuth2Authenticator
   end
 
   def json_walk(result, user_json, prop)
-    path = SiteSetting.send("oauth2_json_#{prop}_path")
+    path = SiteSetting.get("oauth2_json_#{prop}_path")
     if path.present?
       segments = path.split('.')
       val = walk_path(user_json, segments)
diff --git a/spec/plugin_spec.rb b/spec/plugin_spec.rb
index 59bf72e..a80f46f 100644
--- a/spec/plugin_spec.rb
+++ b/spec/plugin_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails_helper'
 require 'json'