diff --git a/epymorph/adrio/numpy.py b/epymorph/adrio/numpy.py
index c2a33020..a24afe7d 100644
--- a/epymorph/adrio/numpy.py
+++ b/epymorph/adrio/numpy.py
@@ -31,7 +31,7 @@ def evaluate(self) -> NDArray:
                 raise DataResourceException(msg)
             axis = 0
             for curr_slice in self.array_slice:
-                if curr_slice is not None and isinstance(curr_slice, slice):
+                if curr_slice is not None:
                     data = data.take(
                         indices=range(curr_slice.start, curr_slice.stop),
                         axis=axis
@@ -66,7 +66,7 @@ def evaluate(self) -> NDArray:
                 raise DataResourceException(msg)
             axis = 0
             for curr_slice in self.array_slice:
-                if curr_slice is not None and isinstance(curr_slice, slice):
+                if curr_slice is not None:
                     data = data.take(
                         indices=range(curr_slice.start, curr_slice.stop),
                         axis=axis