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-rw-r--r--activesupport/lib/active_support/cache.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb
index 3847d8b7ae..3a95d07087 100644
--- a/activesupport/lib/active_support/cache.rb
+++ b/activesupport/lib/active_support/cache.rb
@@ -75,7 +75,7 @@ module ActiveSupport
#
# The +key+ argument can also respond to +cache_key+ or +to_param+.
def expand_cache_key(key, namespace = nil)
- expanded_cache_key = namespace ? "#{namespace}/" : ""
+ expanded_cache_key = (namespace ? "#{namespace}/" : "").dup
if prefix = ENV["RAILS_CACHE_ID"] || ENV["RAILS_APP_VERSION"]
expanded_cache_key << "#{prefix}/"