diff --git a/config/initializers/session_store.rb b/config/initializers/session_store.rb
index 5fe5270236b..bff4b8d097a 100644
--- a/config/initializers/session_store.rb
+++ b/config/initializers/session_store.rb
@@ -2,7 +2,7 @@
 
 Gitlab::Application.config.session_store(
   :redis_store, # Using the cookie_store would enable session replay attacks.
-  servers: Gitlab::Application.config.cache_store[1], # re-use the Redis config from the Rails cache store
+  servers: Gitlab::Application.config.cache_store[1].merge(namespace: 'session:gitlab'), # re-use the Redis config from the Rails cache store
   key: '_gitlab_session',
   secure: Gitlab.config.gitlab.https,
   httponly: true,