diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index bfc9f73213ce..57a35f0faada 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,8 @@
 2018-10-16  Jonathan Wakely  <jwakely@redhat.com>
 
+	* include/bits/random.h (random_device) [!_GLIBCXX_USE_DEV_RANDOM]:
+	Fix default constructor to call correct function.
+
 	* testsuite/experimental/net/internet/address/v4/creation.cc: Do not
 	declare ip in global namespace, to avoid collision with struct ip
 	defined in <netinet/ip.h>.
diff --git a/libstdc++-v3/include/bits/random.h b/libstdc++-v3/include/bits/random.h
index 5e994aa88360..e02a185e3f03 100644
--- a/libstdc++-v3/include/bits/random.h
+++ b/libstdc++-v3/include/bits/random.h
@@ -1611,7 +1611,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     ~random_device()
     { _M_fini(); }
 #else
-    random_device() { _M_init("mt19937"); }
+    random_device() { _M_init_pretr1("mt19937"); }
 
     explicit
     random_device(const std::string& __token)