diff --git a/ax/models/torch/alebo.py b/ax/models/torch/alebo.py
index 99dad0b9a20..7d1f0a8cadf 100644
--- a/ax/models/torch/alebo.py
+++ b/ax/models/torch/alebo.py
@@ -398,7 +398,7 @@ def posterior(
         assert output_indices is None
         assert not observation_noise
         mvn = self(X)
-        posterior = GPyTorchPosterior(mvn=mvn)
+        posterior = GPyTorchPosterior(distribution=mvn)
         if posterior_transform is not None:
             return posterior_transform(posterior)
         return posterior