diff --git a/pandas/tseries/tests/test_tslib.py b/pandas/tseries/tests/test_tslib.py
index 679ee340f72bd..7e772aeb14f6e 100644
--- a/pandas/tseries/tests/test_tslib.py
+++ b/pandas/tseries/tests/test_tslib.py
@@ -390,13 +390,13 @@ def test_today(self):
 
     def test_asm8(self):
         np.random.seed(7960929)
-        ns = np.random.randint(
+        ns = [
             Timestamp.min.value,
             Timestamp.max.value,
             1000,
-        )
+        ]
         for n in ns:
-            self.assertEqual(Timestamp(n).asm8, np.datetime64(int(n), 'ns'), n)
+            self.assertEqual(Timestamp(n).asm8, np.datetime64(n, 'ns'), n)
         self.assertEqual(Timestamp('nat').asm8, np.datetime64('nat', 'ns'))
 
     def test_fields(self):