diff --git a/BayesValidRox/BayesInference/MCMC.py b/BayesValidRox/BayesInference/MCMC.py
index fa5b2f0dd948dd7bedf00a795b206ae47a7a3fed..2f40339261bf8c04b53c6ee492e5625a65ee9c21 100755
--- a/BayesValidRox/BayesInference/MCMC.py
+++ b/BayesValidRox/BayesInference/MCMC.py
@@ -78,7 +78,7 @@ class MCMC():
                 initsamples = priorDist.sample(self.nwalkers).T
             except:
                 # when aPCE selected - gaussian kernel distribution
-                inputSamples = PCEModel.ExpDesign.Input_distributions.T
+                inputSamples = PCEModel.ExpDesign.raw_data.T
                 random_indices = np.random.choice(len(inputSamples),
                                                   size=self.nwalkers,
                                                   replace=False)