diff --git a/omnisafe/adapter/onpolicy_adapter.py b/omnisafe/adapter/onpolicy_adapter.py
index fcef9fe9d..167a87541 100644
--- a/omnisafe/adapter/onpolicy_adapter.py
+++ b/omnisafe/adapter/onpolicy_adapter.py
@@ -108,7 +108,7 @@ def rollout(  # pylint: disable=too-many-locals
                 if num_dones:
                     logger.log(
                         f'\nWarning: trajectory cut off when rollout by epoch\
-                            in {num_dones} of {self._env.num_envs} environments.',
+                            in {self._env.num_envs - num_dones} of {self._env.num_envs} environments.',
                     )
 
             for idx, (done, time_out) in enumerate(zip(terminated, truncated)):