diff --git a/.travis.yml b/.travis.yml
index e176bf823..40700991a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,4 +11,6 @@ branches:
   only:
     - master
 notifications:
-  email: false
+  email:
+    on_failure: change
+    on_succes: never
diff --git a/kernel_tuner/interface.py b/kernel_tuner/interface.py
index 1518475fd..e369d608c 100644
--- a/kernel_tuner/interface.py
+++ b/kernel_tuner/interface.py
@@ -503,7 +503,7 @@ def _get_device_interface(lang, device):
         raise UnImplementedException("Sorry, support for languages other than CUDA, OpenCL, or C is not implemented yet")
     return dev
 
-def _check_kernel_correctness(dev, func, gpu_args, threads, grid, answer, instance_string, atol):
+def _check_kernel_correctness(dev, func, gpu_args, threads, grid, answer, instance_string, atol=1e-6):
     """runs the kernel once and checks the result against answer"""
     for result, expected in zip(gpu_args, answer):
         if expected is not None: