diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index d2a534293691b9c79a018c9ddd4ee2ddcbabba91..0000000000000000000000000000000000000000
--- a/.travis.yml
+++ /dev/null
@@ -1,89 +0,0 @@
-# Check this file before committing a new version:
-# http://lint.travis-ci.org/
-
-language: python
-sudo: false
-dist: xenial
-
-notifications:
-  email:
-    on_success: change
-    on_failure: change
-
-env:
-  - MATPLOTLIB_V=* NUMPY_V=* SCIPY_V=* CYTHON_V=* PYGMENTS_V="=*"
-#  - MATPLOTLIB_V=2.0.2 NUMPY_V=* SCIPY_V=* CYTHON_V=*
-
-jobs:
-  fast_finish: true
-  allow_failures:
-  - python: 2.7  # end of life since Jan 1st, 2020.
-    # have this allowed as there is a bug in matplotlib 2.1.0
-#    - env: MATPLOTLIB_V=* NUMPY_V=* SCIPY_V=* CYTHON_V=*
-  include:
-    - stage: Fast test
-      python: 3.5
-      virtualenv:
-        system_site_packages: true
-      before_install: skip
-      install:
-         - pip install 'matplotlib<3.1'
-         - pip install -r pip-requirements.txt
-      before_script: skip
-      script: ./run-tests.py --fast
-
-    - stage: Tests
-      python: 2.7
-      env: MATPLOTLIB_V=2.2.3
-    - python: 3.5
-      env: MATPLOTLIB_V=3.0
-    - python: 3.6
-    - python: 3.7
-
-    # Ubuntu 14.04.5 LTS
-    # python 2.6 is explicitly NOT supported!
-    - name: "Ubuntu 14.04.5 LTS - Python 3.4"
-      python: 3.4
-      env: MATPLOTLIB_V=1.3.1 NUMPY_V=1.8.1 SCIPY_V=0.13.3 CYTHON_V=0.20.1 EXTRAPACK="libgfortran<3" PYGMENTS_V="<2.4"
-
-    # Ubuntu 16.04.3 LTS
-    - name: "Ubuntu 16.04.3 LTS - Python 2.7"
-      python: 2.7
-      env: MATPLOTLIB_V=1.5.1 NUMPY_V=1.11.0 SCIPY_V=0.17.0 CYTHON_V=0.23.4
-    - name: "Ubuntu 16.04.3 LTS - Python 3.5"
-      python: 3.5
-      env: MATPLOTLIB_V=1.5.1 NUMPY_V=1.11.0 SCIPY_V=0.17.0 CYTHON_V=0.23.4
-
-    # Ubuntu 18.04 LTS
-    - name: "Ubuntu 18.04 LTS - Python 2.7"
-      python: 2.7
-      env: MATPLOTLIB_V=2.1.1 NUMPY_V=1.13.3 SCIPY_V=0.19.1 CYTHON_V=0.26.1
-    - name: "Ubuntu 18.04 LTS - Python 3.6"
-      python: 3.6
-      env: MATPLOTLIB_V=2.1.1 NUMPY_V=1.13.3 SCIPY_V=0.19.1 CYTHON_V=0.26.1
-
-# Install conda
-before_install:
-  - wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh;
-  - chmod +x miniconda.sh
-  - ./miniconda.sh -b -p $HOME/miniconda
-  - export PATH=$HOME/miniconda/bin:$PATH
-  - conda update --yes conda;
-  - conda config --append channels anaconda
-  - conda create -yn pyenv python=$TRAVIS_PYTHON_VERSION atlas numpy=$NUMPY_V scipy=$SCIPY_V matplotlib=$MATPLOTLIB_V nose cython=$CYTHON_V h5py numexpr sphinx pygments$PYGMENTS_V $EXTRAPACK
-  - source activate pyenv
-
-install:
-  - pip install -r pip-requirements.txt
-
-before_script:
-  - uname -a
-  - free -m
-  - df -h
-  - ulimit -a
-  - python -V
-  - cython --version
-
-# run tests
-script:
-  - ./run-tests.py
diff --git a/postpic/helper_fft.py b/postpic/helper_fft.py
index 3ad3e5d195c019cdd49da1e663b5357b00274707..bc57a24bdcb8ac82cf4d0407762cc6b65b12dc45 100644
--- a/postpic/helper_fft.py
+++ b/postpic/helper_fft.py
@@ -72,6 +72,7 @@ class _fft:
     @classmethod
     def _get_defaultkwargf(cls, name):
         wrapped = getattr(cls.fft_module, name)
+
         @functools.wraps(wrapped)
         def ret(*args, **kwargs):
             kws = cls.fft_kwargs.copy()