diff --git a/.travis.yml b/.travis.yml
index e8fd54e..9c9d3bc 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,7 +10,7 @@ install:
 #  - ( $CABAL122 && cabal install cabal-install --constraint "Cabal >= 1.22" && ghc-pkg unregister Cabal ) || true
   - echo $PATH
   - which cabal
-#  - cabal install Cabal --constraint "Cabal == $(cabal --version | grep 'Cabal library' | awk '{ print $3 }' | tail -n1)"
+  - if [ -n "$(cabal --version | grep 'Cabal library' | awk '{ print $3 }' | tail -n1 | sed -n '/^1.18/p')" ]; then cabal install cabal-install --constraint "Cabal == 1.18.* && > 1.18.0"; fi
   - cabal install happy
   - happy --version
   - cabal install -j --only-dependencies --enable-tests --constraint "tagged < 0.8"