diff --git a/src/policy_cache.hpp b/src/policy_cache.hpp
index 90fdf1db..594895be 100644
--- a/src/policy_cache.hpp
+++ b/src/policy_cache.hpp
@@ -35,8 +35,7 @@ using namespace boost::flyweights;
 class PolicyCache
 {
 public:
-  typedef flyweight<std::string> fwstr;
-  typedef boost::concurrent_flat_map<uint64_t,fwstr> Map;
+  typedef boost::concurrent_flat_map<uint64_t,std::string> Map;
 
 public:
   PolicyCache(unsigned const max_size_ = 256)