diff --git a/Gemfile b/Gemfile
index 82fbc701194..ced7f0376e8 100644
--- a/Gemfile
+++ b/Gemfile
@@ -178,16 +178,16 @@ group :test, :development do
   gem 'shoulda-matchers', require: false
   gem 'rspec-html-matchers'
   gem 'pry-nav'
-  gem 'byebug', require: ENV['RM_INFO'].nil?
+  gem 'byebug', require: ENV['RM_INFO'].nil?, platform: :mri
   gem 'rubocop', require: false
   gem "rubocop-discourse", require: false
   gem 'parallel_tests'
 end
 
 group :development do
-  gem 'ruby-prof', require: false
+  gem 'ruby-prof', require: false, platform: :mri
   gem 'bullet', require: !!ENV['BULLET']
-  gem 'better_errors'
+  gem 'better_errors', platform: :mri
   gem 'binding_of_caller'
   gem 'yaml-lint'
   gem 'annotate'
diff --git a/config/environments/development.rb b/config/environments/development.rb
index 5ee92a55aba..ffada27d981 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -39,11 +39,13 @@ Discourse::Application.configure do
 
   config.log_level = ENV['DISCOURSE_DEV_LOG_LEVEL'] if ENV['DISCOURSE_DEV_LOG_LEVEL']
 
-  BetterErrors::Middleware.allow_ip! ENV['TRUSTED_IP'] if ENV['TRUSTED_IP']
+  if defined?(BetterErrors)
+    BetterErrors::Middleware.allow_ip! ENV['TRUSTED_IP'] if ENV['TRUSTED_IP']
 
-  if defined?(Unicorn) && ENV["UNICORN_WORKERS"].to_i != 1
-    # BetterErrors doesn't work with multiple unicorn workers. Disable it to avoid confusion
-    Rails.configuration.middleware.delete BetterErrors::Middleware
+    if defined?(Unicorn) && ENV["UNICORN_WORKERS"].to_i != 1
+      # BetterErrors doesn't work with multiple unicorn workers. Disable it to avoid confusion
+      Rails.configuration.middleware.delete BetterErrors::Middleware
+    end
   end
 
   config.load_mini_profiler = true
@@ -57,7 +59,9 @@ Discourse::Application.configure do
   config.middleware.insert 1, Middleware::MissingAvatars
 
   config.enable_anon_caching = false
-  require 'rbtrace'
+  if RUBY_ENGINE == "ruby"
+    require 'rbtrace'
+  end
 
   if emails = GlobalSetting.developer_emails
     config.developer_emails = emails.split(",").map(&:downcase).map(&:strip)