diff --git a/railties/test/generators/actions_test.rb b/railties/test/generators/actions_test.rb
index d5301dcdb29a..51fa2fe16fe1 100644
--- a/railties/test/generators/actions_test.rb
+++ b/railties/test/generators/actions_test.rb
@@ -180,9 +180,11 @@ def test_generate_should_run_script_generate_with_argument_and_options
   end
 
   def test_rake_should_run_rake_command_with_default_env
-    expected_env = ENV['RAILS_ENV'] || 'development'
-    generator.expects(:run).once.with("rake log:clear RAILS_ENV=#{expected_env}", :verbose => false)
+    generator.expects(:run).once.with("rake log:clear RAILS_ENV=development", :verbose => false)
+    old_env, ENV['RAILS_ENV'] = ENV["RAILS_ENV"], nil
     action :rake, 'log:clear'
+  ensure
+    ENV["RAILS_ENV"] = old_env
   end
 
   def test_rake_with_env_option_should_run_rake_command_in_env
@@ -207,9 +209,11 @@ def test_env_option_should_win_over_rails_env_variable_when_running_rake
   end
 
   def test_rake_with_sudo_option_should_run_rake_command_with_sudo
-    expected_env = ENV['RAILS_ENV'] || 'development'
-    generator.expects(:run).once.with("sudo rake log:clear RAILS_ENV=#{expected_env}", :verbose => false)
+    generator.expects(:run).once.with("sudo rake log:clear RAILS_ENV=development", :verbose => false)
+    old_env, ENV['RAILS_ENV'] = ENV["RAILS_ENV"], nil
     action :rake, 'log:clear', :sudo => true
+  ensure
+    ENV["RAILS_ENV"] = old_env
   end
 
   def test_capify_should_run_the_capify_command