diff --git a/torchrl/envs/libs/dm_control.py b/torchrl/envs/libs/dm_control.py
index 96d392a76c2..3e1aac917e0 100644
--- a/torchrl/envs/libs/dm_control.py
+++ b/torchrl/envs/libs/dm_control.py
@@ -80,8 +80,8 @@ def _dmcontrol_to_torchrl_spec_transform(
             shape = torch.Size([1])
         return BoundedTensorSpec(
             shape=shape,
-            low=spec.low,
-            high=spec.high,
+            low=spec.minimum,
+            high=spec.maximum,
             dtype=dtype,
             device=device,
         )
diff --git a/torchrl/modules/tensordict_module/actors.py b/torchrl/modules/tensordict_module/actors.py
index 870f68b7bf3..8561b026f3c 100644
--- a/torchrl/modules/tensordict_module/actors.py
+++ b/torchrl/modules/tensordict_module/actors.py
@@ -443,7 +443,7 @@ class QValueModule(TensorDictModuleBase):
 
     def __init__(
         self,
-        action_space: Optional[str],
+        action_space: Optional[str] = None,
         action_value_key: Optional[NestedKey] = None,
         action_mask_key: Optional[NestedKey] = None,
         out_keys: Optional[Sequence[NestedKey]] = None,