diff --git a/src/policy_cache.hpp b/src/policy_cache.hpp
index 32d6c6f3..c3b0421b 100644
--- a/src/policy_cache.hpp
+++ b/src/policy_cache.hpp
@@ -35,7 +35,7 @@ using namespace boost::flyweights;
 class PolicyCache
 {
 public:
-  typedef flyweight<std::string,no_tracking> fwstr;
+  typedef flyweight<std::string> fwstr;
   typedef boost::concurrent_flat_map<uint64_t,std::string> Map;
 
   fwstr foo;