-#ifdef USE_ITHREADS
-# define REH_LOCK(M) MUTEX_LOCK(M)
-# define REH_UNLOCK(M) MUTEX_UNLOCK(M)
-#else
-# define REH_LOCK(M) NOOP
-# define REH_UNLOCK(M) NOOP
+#if !defined(cop_hints_fetch_pvn) && XSH_HAS_PERL(5, 9, 5)
+# define cop_hints_fetch_pvn(COP, PKG, PKGLEN, PKGHASH, FLAGS) \
+ Perl_refcounted_he_fetch(aTHX_ (COP)->cop_hints_hash, NULL, \
+ (PKG), (PKGLEN), (FLAGS), (PKGHASH))