and another bugfix

Author: pancetta

.travis.yml

@@ -27,7 +27,7 @@ script:
   - mkdir data
   - which nosetests
   - nosetests --with-coverage --cover-erase --cover-inclusive --cover-package=pySDC/core,pySDC/implementations,pySDC/helpers,pySDC/tutorial --cover-html --cover-html-dir=target/doc/build/test_coverage pySDC/tests
-  - if [[ $PYTHON_VERSION == 3 ]]; then travis-sphinx build; fi
+  - if [[ $PYTHON_VERSION == 3 ]]; then travis-sphinx -n build; fi
 
 after_success:
   - if [[ $PYTHON_VERSION == 3 ]]; then travis-sphinx deploy; fi