diff --git a/keras_tuner/engine/base_tuner.py b/keras_tuner/engine/base_tuner.py
index 9bba6b91c..45feecc52 100644
--- a/keras_tuner/engine/base_tuner.py
+++ b/keras_tuner/engine/base_tuner.py
@@ -248,7 +248,7 @@ def _run_and_update_trial(self, trial, *fit_args, **fit_kwargs):
                 "`self.oracle.update_trial(trial_id, metrics)` "
                 "in `Tuner.run_trial()` to report the metrics is deprecated, "
                 "and will be removed in the future."
-                "Please remove the call and do 'return metrics' "
+                "Please remove the call and do 'return_metrics' "
                 "in `Tuner.run_trial()` instead. ",
                 DeprecationWarning,
                 stacklevel=2,