diff --git a/GPy/inference/latent_function_inference/varDTC.py b/GPy/inference/latent_function_inference/varDTC.py
index fcbe54f9..0cd709b2 100644
--- a/GPy/inference/latent_function_inference/varDTC.py
+++ b/GPy/inference/latent_function_inference/varDTC.py
@@ -173,7 +173,7 @@ class VarDTC(object):
             raise NotImplementedError #TODO
 
         #construct a posterior object
-        post = Posterior(woodbury_chol=None, woodbury_vector=Cpsi1V, K=None, mean=None, cov=None, K_chol=None):
+        post = Posterior(woodbury_chol=None, woodbury_vector=Cpsi1V, K=None, mean=None, cov=None, K_chol=None)
         return