diff --git a/lnn/symbolic/logic.py b/lnn/symbolic/logic.py
index c2900ce..478de86 100644
--- a/lnn/symbolic/logic.py
+++ b/lnn/symbolic/logic.py
@@ -1312,7 +1312,7 @@ def upward(self, **kwds) -> torch.Tensor:
             None, _utils.negate_bounds(self.operand.get_facts(*groundings))
         )
 
-    def downward(self) -> torch.Tensor:
+    def downward(self, **kwds) -> torch.Tensor:
         if self.propositional:
             groundings = {None}
         else: