diff --git a/datasketch/minhash.py b/datasketch/minhash.py
index 31422986..6fe9f81d 100644
--- a/datasketch/minhash.py
+++ b/datasketch/minhash.py
@@ -48,7 +48,7 @@ def __init__(self, num_perm=128, seed=1, hashobj=sha1,
         if hashvalues is not None:
             self.hashvalues = hashvalues
         else:
-            self.hashvalues = np.array([_max_hash for _ in range(num_perm)])
+            self.hashvalues = np.array([_max_hash for _ in range(num_perm)], dtype=np.int)
         # Initalize permutation function parameters
         if permutations is not None:
             self.permutations = permutations
@@ -88,7 +88,7 @@ def clear(self):
         '''
         Clear the current state of the Minhash.
         '''
-        self.hashvalues = np.array([_max_hash for _ in range(num_perm)])
+        self.hashvalues = np.array([_max_hash for _ in range(num_perm)], dtype=np.int)
 
     def copy(self):
         '''
diff --git a/datasketch/weighted_minhash.py b/datasketch/weighted_minhash.py
index 336218f7..0497e693 100644
--- a/datasketch/weighted_minhash.py
+++ b/datasketch/weighted_minhash.py
@@ -87,7 +87,7 @@ def minhash(self, v):
             raise ValueError("Input dimension mismatch, expecting %d" % self.dim)
         if not isinstance(v, np.ndarray):
             v = np.array(v)
-        hashvalues = np.zeros((self.sample_size, 2))
+        hashvalues = np.zeros((self.sample_size, 2), dtype=np.int)
         for i in range(self.sample_size):
             t = np.floor((np.log(v) / self.rs[i]) + self.betas[i])
             ln_y = (t - self.betas[i]) * self.rs[i]
diff --git a/test/weighted_minhash_test.py b/test/weighted_minhash_test.py
index 5046931f..f384909b 100644
--- a/test/weighted_minhash_test.py
+++ b/test/weighted_minhash_test.py
@@ -28,6 +28,7 @@ def test_minhash(self):
         self.assertIsInstance(m, WeightedMinHash)
         self.assertEqual(len(m.hashvalues), 4)
         self.assertEqual(len(m), 4)
+        self.assertTrue(m.hashvalues.dtype == np.int)
 
 if __name__ == "__main__":
     unittest.main()