diff --git a/vizier/_src/algorithms/designers/gp_bandit.py b/vizier/_src/algorithms/designers/gp_bandit.py
index ba6a0f005..970a065e8 100644
--- a/vizier/_src/algorithms/designers/gp_bandit.py
+++ b/vizier/_src/algorithms/designers/gp_bandit.py
@@ -209,6 +209,7 @@ def update(
     del all_active
     self._trials.extend(copy.deepcopy(completed.trials))
 
+  @_experimental_override_allowed
   def set_priors(self, prior_studies: Sequence[vza.CompletedTrials]) -> None:
     """Updates the list of prior studies for transfer learning.