diff --git a/tdmpc2/common/parser.py b/tdmpc2/common/parser.py
index e931cd5..90196a3 100755
--- a/tdmpc2/common/parser.py
+++ b/tdmpc2/common/parser.py
@@ -78,7 +78,9 @@ def parse_cfg(cfg: OmegaConf) -> OmegaConf:
 	cfg.tasks = TASK_SET.get(cfg.task, [cfg.task])
 
 	# Check action space compatibility
-	if cfg.get('action', 'continuous') == 'discrete':
+	assert cfg.action in ['continuous', 'discrete'], \
+		f'Invalid action space {cfg.action}. Must be one of ["continuous", "discrete"]'
+	if cfg.action == 'discrete':
 		assert not cfg.multitask, 'Discrete actions are not supported in multi-task settings.'
 
 	# Check torch.compile compatibility
diff --git a/tdmpc2/envs/__init__.py b/tdmpc2/envs/__init__.py
index 3b3f91c..7da75d3 100644
--- a/tdmpc2/envs/__init__.py
+++ b/tdmpc2/envs/__init__.py
@@ -74,7 +74,7 @@ def make_env(cfg):
 		env = TensorWrapper(env)
 	if cfg.get('obs', 'state') == 'rgb':
 		env = PixelWrapper(cfg, env)
-	if cfg.get('action', 'discrete'):
+	if cfg.get('action', 'continuous') == 'discrete':
 		env = DiscreteWrapper(env)
 	try: # Dict
 		cfg.obs_shape = {k: v.shape for k, v in env.observation_space.spaces.items()}