diff --git a/fancy_gym/envs/mujoco/hopper_jump/hopper_jump.py b/fancy_gym/envs/mujoco/hopper_jump/hopper_jump.py
index 53d9265..0da71db 100644
--- a/fancy_gym/envs/mujoco/hopper_jump/hopper_jump.py
+++ b/fancy_gym/envs/mujoco/hopper_jump/hopper_jump.py
@@ -69,11 +69,11 @@ class HopperEnvCustomXML(HopperEnv):
 
         if exclude_current_positions_from_observation:
             observation_space = Box(
-                low=-np.inf, high=np.inf, shape=(11,), dtype=np.float64
+                low=-np.inf, high=np.inf, shape=(13,), dtype=np.float64
             )
         else:
             observation_space = Box(
-                low=-np.inf, high=np.inf, shape=(12,), dtype=np.float64
+                low=-np.inf, high=np.inf, shape=(14,), dtype=np.float64
             )
 
         MujocoEnv.__init__(