diff --git a/lib/rack/cache/metastore.rb b/lib/rack/cache/metastore.rb
index 2eb56d1..011401d 100644
--- a/lib/rack/cache/metastore.rb
+++ b/lib/rack/cache/metastore.rb
@@ -80,7 +80,11 @@ def store(request, response, entity_store)
       headers.delete 'Age'
 
       entries.unshift [stored_env, headers]
-      write key, entries
+      if request.env['rack-cache.use_native_ttl'] && response.fresh?
+        write key, entries, response.ttl
+      else
+        write key, entries
+      end
       key
     end
 
@@ -105,7 +109,13 @@ def invalidate(request, entity_store)
             [req, res]
           end
         end
-      write key, entries if modified
+      if modified
+        if request.env['rack-cache.use_native_ttl'] && response.fresh?
+          write key, entries, response.ttl
+        else
+          write key, entries
+        end
+      end
     end
 
   private
@@ -154,7 +164,7 @@ def read(key)
     # Store an Array of request/response pairs for the given key. Concrete
     # implementations should not attempt to filter or concatenate the
     # list in any way.
-    def write(key, negotiations)
+    def write(key, negotiations, ttl=nil)
       raise NotImplemented
     end
 
@@ -187,7 +197,7 @@ def read(key)
         end
       end
 
-      def write(key, entries)
+      def write(key, entries, ttl=nil)
         @hash[key] = Marshal.dump(entries)
       end
 
@@ -225,7 +235,7 @@ def read(key)
         []
       end
 
-      def write(key, entries)
+      def write(key, entries, ttl=nil)
         tries = 0
         begin
           path = key_path(key)
@@ -324,9 +334,9 @@ def read(key)
         cache.get(key) || []
       end
 
-      def write(key, entries)
+      def write(key, entries, ttl=nil)
         key = hexdigest(key)
-        cache.set(key, entries)
+        cache.set(key, entries, ttl)
       end
 
       def purge(key)
@@ -358,9 +368,9 @@ def read(key)
         []
       end
 
-      def write(key, entries)
+      def write(key, entries, ttl=nil)
         key = hexdigest(key)
-        cache.set(key, entries)
+        cache.set(key, entries, ttl)
       end
 
       def purge(key)
@@ -393,9 +403,9 @@ def read(key)
         cache.get(key) || []
       end
 
-      def write(key, entries)
+      def write(key, entries, ttl=nil)
         key = hexdigest(key)
-        cache.put(key, entries)
+        cache.put(key, entries, ttl)
       end
 
       def purge(key)
diff --git a/rack-cache.gemspec b/rack-cache.gemspec
index d2b67c9..1df75bf 100644
--- a/rack-cache.gemspec
+++ b/rack-cache.gemspec
@@ -3,8 +3,8 @@ Gem::Specification.new do |s|
   s.required_rubygems_version = Gem::Requirement.new(">= 0") if s.respond_to? :required_rubygems_version=
 
   s.name = 'rack-cache'
-  s.version = '1.2'
-  s.date = '2012-03-05'
+  s.version = '1.2.1'
+  s.date = '2012-10-30'
 
   s.summary     = "HTTP Caching for Rack"
   s.description = "Rack::Cache is suitable as a quick drop-in component to enable HTTP caching for Rack-based applications that produce freshness (Expires, Cache-Control) and/or validation (Last-Modified, ETag) information."