diff --git a/actionpack/lib/abstract_controller/translation.rb b/actionpack/lib/abstract_controller/translation.rb
index 666e154e4cae4a1aa124e90a1a6891bf36c27050..4dad2a2b938f846c26ff8e23949b7373b7b92cb3 100644
--- a/actionpack/lib/abstract_controller/translation.rb
+++ b/actionpack/lib/abstract_controller/translation.rb
@@ -11,6 +11,7 @@ module Translation
     # to translate many keys within the same controller / action and gives you a
     # simple framework for scoping them consistently.
     def translate(key, options = {})
+      options = options.dup
       if key.to_s.first == "."
         path = controller_path.tr("/", ".")
         defaults = [:"#{path}#{key}"]