diff --git a/GPy/likelihoods/sstudent_t.py b/GPy/likelihoods/sstudent_t.py
index e8fb03ce..790c1437 100644
--- a/GPy/likelihoods/sstudent_t.py
+++ b/GPy/likelihoods/sstudent_t.py
@@ -4,7 +4,7 @@
 
 import sympy as sym
 from sympy.utilities.lambdify import lambdify
-from GPy.util.symbolic import gammaln
+# does not exist! JH from GPy.util.symbolic import gammaln
 
 import numpy as np
 import link_functions