diff --git a/.travis.yml b/.travis.yml
index 5bdd29d..7a054b5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -40,6 +40,11 @@ before_install:
     - export PATH=/opt/ghcjs/8.2/bin:$PATH
     - export PATH=$TRAVIS_BUILD_DIR/node_modules/.bin:$PATH
     - du -sh $HOME/.ghcjs $HOME/.ghc $HOME/.cabal/bin $HOME/.cabal/lib $HOME/.cabal/share
+    - rm -f ~/.cabal/config
+    - cabal update # to ensure the config exists
+    - 'fgrep hackage-ghcjs-overlay.nomeata.de/ $HOME/.cabal/config ||
+      echo -e "repository ghcjs-overlay\n url: http://hackage-ghcjs-overlay.nomeata.de/\n secure: True\n root-keys:\n key-threshold: 0" >> ~/.cabal/config'
+    - cat ~/.cabal/config
     - cabal update
 
 jobs: