diff --git a/.travis.yml b/.travis.yml
index 2e373eb..23e522b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -24,7 +24,7 @@ install:
  - echo "$(ghc --version) [$(ghc --print-project-git-commit-id 2> /dev/null || echo '?')]"
  - travis_retry cabal update
  - cabal install alex happy
- - cabal install --only-dependencies --enable-tests --enable-benchmarks
+ - cabal install --only-dependencies --enable-tests --enable-benchmarks -j1
 
 # Here starts the actual work to be performed for the package under test; any command which exits with a non-zero exit code causes the build to fail.
 script: