diff --git a/GPy/kern/_src/spline.py b/GPy/kern/_src/spline.py
index bcef8548..233cf7e8 100644
--- a/GPy/kern/_src/spline.py
+++ b/GPy/kern/_src/spline.py
@@ -2,7 +2,7 @@
 # Licensed under the BSD 3-clause license (see LICENSE.txt)
 
 import numpy as np
-from kern import Kern
+from .kern import Kern
 from ...core.parameterization import Param
 from ...core.parameterization.transformations import Logexp
 class Spline(Kern):