diff --git a/pymc/sampling/mcmc.py b/pymc/sampling/mcmc.py
index baf2946de55..290d2a00833 100644
--- a/pymc/sampling/mcmc.py
+++ b/pymc/sampling/mcmc.py
@@ -348,7 +348,7 @@ def sample(
     discard_tuned_samples: bool = True,
     compute_convergence_checks: bool = True,
     keep_warning_stat: bool = False,
-    return_inferencedata: Literal[True],
+    return_inferencedata: Literal[True] = True,
     idata_kwargs: Optional[Dict[str, Any]] = None,
     nuts_sampler_kwargs: Optional[Dict[str, Any]] = None,
     callback=None,