diff --git a/python/gtsam/specializations/gtsam.h b/python/gtsam/specializations/gtsam.h
index da8842eaf..d15a8fa11 100644
--- a/python/gtsam/specializations/gtsam.h
+++ b/python/gtsam/specializations/gtsam.h
@@ -10,3 +10,15 @@
  * with `PYBIND11_MAKE_OPAQUE` this allows the types to be modified with Python,
  * and saves one copy operation.
  */
+
+/*
+ * Custom Pybind11 module for the Mersenne-Twister PRNG object
+ * `std::mt19937_64`.
+ * This can be invoked with `gtsam.MT19937()` and passed
+ * wherever a rng pointer is expected.
+ */
+#include <random>
+py::class_<std::mt19937_64>(m_, "MT19937")
+    .def(py::init<>())
+    .def(py::init<std::mt19937_64::result_type>())
+    .def("__call__", &std::mt19937_64::operator());