diff --git a/coffea/util.py b/coffea/util.py
index ee456a56bd..3e9d62c376 100644
--- a/coffea/util.py
+++ b/coffea/util.py
@@ -73,9 +73,9 @@ def _ensure_flat(array, allow_missing=False):
     aktype = ak.type(array)
     if not isinstance(aktype, ak.types.ArrayType):
         raise ValueError("Expected an array type, received: %r" % aktype)
-    isprimitive = isinstance(aktype.type, ak.types.PrimitiveType)
-    isoptionprimitive = isinstance(aktype.type, ak.types.OptionType) and isinstance(
-        aktype.type.type, ak.types.PrimitiveType
+    isprimitive = isinstance(aktype.content, ak.types.NumpyType)
+    isoptionprimitive = isinstance(aktype.content, ak.types.OptionType) and isinstance(
+        aktype.content.content, ak.types.NumpyType
     )
     if allow_missing and not (isprimitive or isoptionprimitive):
         raise ValueError(
diff --git a/tests/test_analysis_tools.py b/tests/test_analysis_tools.py
index aeebd93555..476140416b 100644
--- a/tests/test_analysis_tools.py
+++ b/tests/test_analysis_tools.py
@@ -167,12 +167,12 @@ def test_packed_selection():
     sel = PackedSelection()
 
     shape = (10,)
-    all_true = np.full(shape=shape, fill_value=True, dtype=np.bool)
-    all_false = np.full(shape=shape, fill_value=False, dtype=np.bool)
+    all_true = np.full(shape=shape, fill_value=True, dtype=bool)
+    all_false = np.full(shape=shape, fill_value=False, dtype=bool)
     fizz = np.arange(shape[0]) % 3 == 0
     buzz = np.arange(shape[0]) % 5 == 0
     ones = np.ones(shape=shape, dtype=np.uint64)
-    wrong_shape = ones = np.ones(shape=(shape[0] - 5,), dtype=np.bool)
+    wrong_shape = ones = np.ones(shape=(shape[0] - 5,), dtype=bool)
 
     sel.add("all_true", all_true)
     sel.add("all_false", all_false)