diff --git a/src/lerobot/constants.py b/src/lerobot/constants.py
index bc5b2013c..30777239e 100644
--- a/src/lerobot/constants.py
+++ b/src/lerobot/constants.py
@@ -20,7 +20,6 @@ from huggingface_hub.constants import HF_HOME
 OBS_ENV_STATE = "observation.environment_state"
 OBS_STATE = "observation.state"
 OBS_IMAGE = "observation.image"
-OBS_IMAGE_2 = "observation.image2"
 OBS_IMAGES = "observation.images"
 ACTION = "action"
 REWARD = "next.reward"