diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index a70559d410..2157fcac65 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,4 +1,4 @@
-RAILS_ENV ||= "test"
+RAILS_ENV = "test" unless defined? RAILS_ENV
 
 # prevent case where we are using rubygems and test-unit 2.x is installed
 begin
@@ -15,7 +15,7 @@ rescue LoadError => error
 
     You need to install rspec in your Redmine project.
     Please execute the following code:
-    
+
       gem install rspec-rails
       script/generate rspec