diff --git a/pymc/distributions/distribution.py b/pymc/distributions/distribution.py
index bf89c6ee14..a6796bac0a 100644
--- a/pymc/distributions/distribution.py
+++ b/pymc/distributions/distribution.py
@@ -443,8 +443,8 @@ def change_symbolic_rv_size(op: SymbolicRandomVariable, rv, new_size, expand) ->
 class Distribution(metaclass=DistributionMeta):
     """Statistical distribution"""
 
-    rv_op: Callable[..., TensorVariable] | None = None
-    rv_type: MetaType | None = None
+    rv_op: Callable[..., TensorVariable]
+    rv_type: MetaType
 
     def __new__(
         cls,