diff --git a/imgaug/augmenters/meta.py b/imgaug/augmenters/meta.py
index 9279a0a4d..1de256e8e 100644
--- a/imgaug/augmenters/meta.py
+++ b/imgaug/augmenters/meta.py
@@ -3384,7 +3384,7 @@ def _get_augmenter_active(self, nb_rows, random_state):
         # pylint: disable=invalid-name
         nn = self._get_n(nb_rows, random_state)
         nn = [min(n, len(self)) for n in nn]
-        augmenter_active = np.zeros((nb_rows, len(self)), dtype=np.bool)
+        augmenter_active = np.zeros((nb_rows, len(self)), dtype=np.bool_)
         for row_idx, n_true in enumerate(nn):
             if n_true > 0:
                 augmenter_active[row_idx, 0:n_true] = 1