diff --git a/rllib/tuned_examples/hyperband-cartpole.yaml b/rllib/tuned_examples/hyperband-cartpole.yaml
index 8c0a510bc..dee9c0fc0 100644
--- a/rllib/tuned_examples/hyperband-cartpole.yaml
+++ b/rllib/tuned_examples/hyperband-cartpole.yaml
@@ -11,4 +11,4 @@ cartpole-ppo:
             grid_search: [1, 4]
         sgd_minibatch_size:
             grid_search: [128, 256, 512]
-        observation_fliter: MeanStdFilter
+        observation_filter: MeanStdFilter