diff --git a/.travis.yml b/.travis.yml
index a7bac06..f61ed3c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,4 +18,4 @@ python:
 install:
   - pip install .
   - pip install -r requirements.txt
-script: pytest
+script: python -m pytest
diff --git a/pyspeedup/concurrent/_cache.py b/pyspeedup/concurrent/_cache.py
index f901cee..8a3178e 100644
--- a/pyspeedup/concurrent/_cache.py
+++ b/pyspeedup/concurrent/_cache.py
@@ -15,7 +15,10 @@
 
 def _closeProcessGracefully(instance):
     if instance is not None:
-        instance._q.put(_EndProcess)
+        try:
+            instance._q.put(_EndProcess)
+        except AssertionError:
+            pass
         instance._q.close()
         instance._t.terminate()
         instance._t.join()