diff --git a/src/bayesvalidrox/surrogate_models/exp_designs.py b/src/bayesvalidrox/surrogate_models/exp_designs.py
index f588b6bc384444eb0b03f980782b14a7c627bc56..a078aec9c19c5a85a637ba50d02c48459ceea6d3 100644
--- a/src/bayesvalidrox/surrogate_models/exp_designs.py
+++ b/src/bayesvalidrox/surrogate_models/exp_designs.py
@@ -413,9 +413,10 @@ class ExpDesigns:
 
             elif 'lognorm' in dist_type.lower():
                 polytype = 'hermite'
-                # Mu = np.log(params[0]**2/np.sqrt(params[0]**2 + params[1]**2))
-                # Sigma = np.sqrt(np.log(1 + params[1]**2 / params[0]**2))
-                dist = chaospy.LogNormal(mu=params[0], sigma=params[1])
+                mu = np.log(params[0]**2/np.sqrt(params[0]**2 + params[1]**2))
+                sigma = np.sqrt(np.log(1 + params[1]**2 / params[0]**2))
+                dist = chaospy.LogNormal(mu, sigma)
+                # dist = chaospy.LogNormal(mu=params[0], sigma=params[1])
 
             elif 'expon' in dist_type.lower():
                 polytype = 'arbitrary'