diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index c9741c53a2f..831fd0c42c5 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -497,7 +497,6 @@ AC_CHECK_HEADERS([dlfcn.h execinfo.h fcntl.h inttypes.h limits.h link.h])
 AC_CHECK_HEADERS([malloc.h signal.h stdint.h unistd.h utime.h windows.h])
 AC_CHECK_HEADERS([sys/mman.h sys/param.h sys/resource.h sys/time.h sys/types.h])
 AC_CHECK_HEADERS([malloc/malloc.h])
-AC_CHECK_HEADERS([rw/stdex/hash_map.h rw/stdex/hash_set.h])
 if test "$ENABLE_THREADS" -eq 1 ; then
   AC_CHECK_HEADERS(pthread.h)
 fi