config/environments/development.rb                    | 4 ++++
 config/environments/production.rb                     | 4 ++++
 config/initializers/40-openid_authentication_store.rb | 7 +++++++
 3 files changed, 15 insertions(+)

diff --git a/config/environments/development.rb b/config/environments/development.rb
index bd92c55..3f5773d 100644
--- a/config/environments/development.rb
+++ b/config/environments/development.rb
@@ -16,4 +16,8 @@ RedmineApp::Application.configure do
   config.action_mailer.raise_delivery_errors = false
 
   config.active_support.deprecation = :log
+  
+  # Configure OpenIdAuthentication.store
+  # allowed values: :memory, :file, :memcache
+  config.openid_authentication_store = :file
 end
diff --git a/config/environments/production.rb b/config/environments/production.rb
index ab4cd40..021fac8 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -29,4 +29,8 @@ RedmineApp::Application.configure do
   config.action_mailer.logger = nil
 
   config.active_support.deprecation = :log
+  
+  # Configure OpenIdAuthentication.store
+  # allowed values: :memory, :file, :memcache
+  config.openid_authentication_store = :memory
 end
diff --git a/config/initializers/40-openid_authentication_store.rb b/config/initializers/40-openid_authentication_store.rb
new file mode 100644
index 0000000..f56d072
--- /dev/null
+++ b/config/initializers/40-openid_authentication_store.rb
@@ -0,0 +1,7 @@
+# Default value
+authentication_store = :memory
+
+# Override with enviroment setting if present
+authentication_store = RedmineApp::Application.config.openid_authentication_store unless RedmineApp::Application.config.openid_authentication_store.blank?
+
+OpenIdAuthentication.store = authentication_store
\ No newline at end of file