diff --git a/GPy/kern/__init__.py b/GPy/kern/__init__.py
index 718be74f..57883343 100644
--- a/GPy/kern/__init__.py
+++ b/GPy/kern/__init__.py
@@ -15,6 +15,8 @@ from _src.ODE_t import ODE_t
 from _src.poly import Poly
 from _src.eq_ode2 import EQ_ODE2
 
+from _src.materngrad import Matern32grad
+
 from _src.trunclinear import TruncLinear,TruncLinear_inf
 from _src.splitKern import SplitKern,DiffGenomeKern