diff --git a/datascience/util.py b/datascience/util.py
index 67aca12b9..31abf864b 100644
--- a/datascience/util.py
+++ b/datascience/util.py
@@ -36,12 +36,15 @@ def make_array(*elements):
     >>> make_array("foo", "bar")
     array(['foo', 'bar'],
           dtype='<U3')
+    >>> make_array(True, False)
+    array([ True, False], dtype=bool)
     >>> make_array()
     array([], dtype=float64)
     """
-    if elements and all(isinstance(item, (int, np.integer)) for item in elements):
+    if elements and all(isinstance(item, (int, np.integer)) and not isinstance(item, bool) for item in elements):
         # Specifically added for Windows machines where the default 
         # integer is int32 - see GH issue #339.
+        # and ensures item is not bool, see issue #622.
         return np.array(elements, dtype="int64")
 
     # Manually cast `elements` as an object due to this: https://github.com/data-8/datascience/issues/458
diff --git a/tests/test_util.py b/tests/test_util.py
index 95a68e3a8..dabde1e19 100644
--- a/tests/test_util.py
+++ b/tests/test_util.py
@@ -20,6 +20,8 @@ def test_make_array():
     assert test3.dtype == "<U3"
     test4 = ds.make_array(list(range(10)))
     assert test4.dtype == "object"
+    test5 = ds.make_array(True, False)
+    assert test5.dtype == "bool"
 
 
 def test_percentile():
@@ -121,4 +123,4 @@ def __getitem__(self, index):
         def __len__(self):
             pass
     is_sequence = IsSequence()
-    assert ds.is_non_string_iterable(is_sequence) == True
\ No newline at end of file
+    assert ds.is_non_string_iterable(is_sequence) == True