diff --git a/randomstate/randomstate.pyx b/randomstate/randomstate.pyx
index 6d1100f0..5b83ee2a 100644
--- a/randomstate/randomstate.pyx
+++ b/randomstate/randomstate.pyx
@@ -168,6 +168,7 @@ cdef class RandomState:
     __MAXSIZE = <uint64_t>sys.maxsize
     cdef object __seed
     cdef object __stream
+    cdef object __version
 
     IF RS_RNG_SEED==1:
         def __init__(self, seed=None):
@@ -176,6 +177,8 @@ cdef class RandomState:
             IF RS_RNG_MOD_NAME == 'dsfmt':
                 self.rng_state.buffered_uniforms = <double *>PyArray_malloc_aligned(2 * DSFMT_N * sizeof(double))
             self.lock = Lock()
+            self.__version = 0
+
             self.__seed = seed
             self.__stream = None
 
@@ -186,6 +189,8 @@ cdef class RandomState:
             self.rng_state.rng = <rng_t *>PyArray_malloc_aligned(sizeof(rng_t))
             self.rng_state.binomial = &self.binomial_info
             self.lock = Lock()
+            self.__version = 0
+
             self.__seed = seed
             self.__stream = stream
 
@@ -444,7 +449,8 @@ cdef class RandomState:
                      'state': _get_state(self.rng_state),
                      'gauss': {'has_gauss': self.rng_state.has_gauss, 'gauss': self.rng_state.gauss},
                      'uint32': {'has_uint32': self.rng_state.has_uint32, 'uint32': self.rng_state.uinteger},
-                     'seed': self.__seed}
+                     'seed': self.__seed,
+                     'version': self.__version}
             if self.__stream is not None:
                 state['stream'] = self.__stream
             return state
@@ -485,7 +491,8 @@ cdef class RandomState:
                      'state': _get_state(self.rng_state),
                      'gauss': {'has_gauss': self.rng_state.has_gauss, 'gauss': self.rng_state.gauss},
                      'uint32': {'has_uint32': self.rng_state.has_uint32, 'uint32': self.rng_state.uinteger},
-                     'seed': self.__seed}
+                     'seed': self.__seed,
+                     'version': self.__version}
             if self.__stream is not None:
                 state['stream'] = self.__stream
             return state
@@ -545,6 +552,9 @@ cdef class RandomState:
 
         if state['name'] != rng_name:
             raise ValueError('Not a ' + rng_name + ' RNG state')
+        if 'version' in state:
+            if state['version'] != 0:
+                raise NotImplementedError('Support for multiple version has not been implemented.')
 
         _set_state(&self.rng_state, state['state'])
         self.rng_state.has_gauss = state['gauss']['has_gauss']
diff --git a/randomstate/tests/test_smoke.py b/randomstate/tests/test_smoke.py
index e40c21d4..7c1571b5 100644
--- a/randomstate/tests/test_smoke.py
+++ b/randomstate/tests/test_smoke.py
@@ -445,6 +445,11 @@ def test_pickle(self):
         print(unpick.get_state())
         assert_(comp_state(self.rs.get_state(), unpick.get_state()))
 
+    def test_version(self):
+        state = self.rs.get_state()
+        assert_('version' in state)
+        assert_(state['version'] == 0)
+
     def test_seed_array(self):
         if self.seed_vector_bits is None:
             raise SkipTest