diff --git a/graphblas/operator.py b/graphblas/operator.py
index 29cf4af29..2e28b4262 100644
--- a/graphblas/operator.py
+++ b/graphblas/operator.py
@@ -1466,7 +1466,7 @@ def register_new(cls, name, func, *, parameterized=False, is_udt=False, lazy=Fal
     def _initialize(cls):
         if cls._initialized:
             return
-        super()._initialize()
+        super()._initialize(include_in_ops=False)
         # Update type information to include UINT64 for positional ops
         for name in ("tril", "triu", "diag", "offdiag", "colle", "colgt", "rowle", "rowgt"):
             op = getattr(indexunary, name)
diff --git a/graphblas/tests/test_op.py b/graphblas/tests/test_op.py
index a222675c7..e7c2fbd51 100644
--- a/graphblas/tests/test_op.py
+++ b/graphblas/tests/test_op.py
@@ -685,12 +685,11 @@ def test_op_namespace():
     # Make sure all have been initialized so `vars` below works
     for key in list(op._delayed):  # pragma: no cover
         getattr(op, key)
-    known_aliases = {"index", "indexle", "indexgt"}
     opnames = {
         key
         for key, val in vars(op).items()
         if isinstance(val, (operator.OpBase, operator.ParameterizedUdf))
-    } | known_aliases
+    }
     unarynames = {
         key
         for key, val in vars(unary).items()
@@ -725,11 +724,10 @@ def test_op_namespace():
     assert not binarynames - opnames, binarynames - opnames
     assert not monoidnames - opnames, monoidnames - opnames
     assert not semiringnames - opnames, semiringnames - opnames
-    assert not indexunarynames - opnames, indexunarynames - opnames
-    assert not selectnames - opnames, selectnames - opnames
-    assert not opnames - (
-        unarynames | binarynames | monoidnames | semiringnames | indexunarynames | selectnames
-    )
+    assert not opnames - (unarynames | binarynames | monoidnames | semiringnames)
+    # These are not part of the `op` namespace
+    assert indexunarynames - opnames == indexunarynames, indexunarynames - opnames
+    assert selectnames - opnames == selectnames, selectnames - opnames
 
 
 @pytest.mark.slow