diff --git a/lib/rack/cache/redis_entitystore.rb b/lib/rack/cache/redis_entitystore.rb
index 75a0402..1907e9e 100644
--- a/lib/rack/cache/redis_entitystore.rb
+++ b/lib/rack/cache/redis_entitystore.rb
@@ -1,4 +1,5 @@
 require 'rack/cache/entitystore'
+require 'redis-rack-cache/constants'
 
 module Rack
   module Cache
@@ -36,11 +37,8 @@ def write(body, ttl=0)
           buf = StringIO.new
           key, size = slurp(body){|part| buf.write(part) }
 
-          if ttl.zero?
-            [key, size] if cache.set(key, buf.string)
-          else
-            [key, size] if cache.setex(key, ttl, buf.string)
-          end
+          ttl = ::Redis::Rack::Cache::DEFAULT_TTL if ttl.zero?
+          [key, size] if cache.setex(key, ttl, buf.string)
         end
 
         def purge(key)
diff --git a/lib/rack/cache/redis_metastore.rb b/lib/rack/cache/redis_metastore.rb
index 2084cf5..157fb57 100644
--- a/lib/rack/cache/redis_metastore.rb
+++ b/lib/rack/cache/redis_metastore.rb
@@ -2,6 +2,7 @@
 require 'rack/utils'
 require 'rack/cache/key'
 require 'rack/cache/metastore'
+require 'redis-rack-cache/constants'
 
 module Rack
   module Cache
@@ -30,11 +31,8 @@ def read(key)
         end
 
         def write(key, entries, ttl=0)
-          if ttl.zero?
-            cache.set(hexdigest(key), entries)
-          else
-            cache.setex(hexdigest(key), ttl, entries)
-          end
+          ttl = ::Redis::Rack::Cache::DEFAULT_TTL if ttl.zero?
+          cache.setex(hexdigest(key), ttl, entries)
         end
 
         def purge(key)
diff --git a/lib/redis-rack-cache/constants.rb b/lib/redis-rack-cache/constants.rb
new file mode 100644
index 0000000..6e91020
--- /dev/null
+++ b/lib/redis-rack-cache/constants.rb
@@ -0,0 +1,7 @@
+class Redis
+  module Rack
+    module Cache
+      DEFAULT_TTL = 86_400 * 365 # 1 year
+    end
+  end
+end