diff --git a/bilby/core/sampler/pymc3.py b/bilby/core/sampler/pymc3.py
index 68d58fb77da88db149ae2cef7a7ee7853db98285..a6e83cc936db564f1baccc0950d025b0d4239967 100644
--- a/bilby/core/sampler/pymc3.py
+++ b/bilby/core/sampler/pymc3.py
@@ -5,7 +5,7 @@ from collections import OrderedDict
 import numpy as np
 
 from ..utils import derivatives, infer_args_from_method
-from ..prior import DeltaFunction, Sine, Cosine, PowerLaw
+from ..prior import DeltaFunction, Sine, Cosine, PowerLaw, MultivariateGaussian
 from .base_sampler import Sampler, MCMCSampler
 from ..likelihood import GaussianLikelihood, PoissonLikelihood, ExponentialLikelihood, \
     StudentTLikelihood