diff --git a/src/pystencils_autodiff/autodiff.py b/src/pystencils_autodiff/autodiff.py
index 6aea11c47cc90b01b444d5257d6583ccaebddd11..a864db501d8e484e3115771307dbd6be022ba4e5 100644
--- a/src/pystencils_autodiff/autodiff.py
+++ b/src/pystencils_autodiff/autodiff.py
@@ -99,7 +99,7 @@ Backward:
                 raise NotImplementedError()
 
     def __hash__(self):
-        return hash(str(self.forward_assignments), str(self.backward_assignments))
+        return hash((str(self.forward_assignments), str(self.backward_assignments)))
 
     def __repr__(self):
         return self._REPR_TEMPLATE.render(forward_assignments=str(self.forward_assignments),