diff --git a/GPy/likelihoods/__init__.py b/GPy/likelihoods/__init__.py
index 5d5d692a..d7ad5753 100644
--- a/GPy/likelihoods/__init__.py
+++ b/GPy/likelihoods/__init__.py
@@ -15,8 +15,8 @@ except ImportError:
 if sympy_available:
     # These are likelihoods that rely on symbolic.
     from symbolic import Symbolic
-    from sstudent_t import SstudentT
+    #from sstudent_t import SstudentT
     from negative_binomial import Negative_binomial
-    from skew_normal import Skew_normal
-    from skew_exponential import Skew_exponential
-    from null_category import Null_category
+    #from skew_normal import Skew_normal
+    #from skew_exponential import Skew_exponential
+    #from null_category import Null_category