diff --git a/.travis.yml b/.travis.yml
index 27175a8..eda70f3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,9 +21,6 @@ matrix:
 #    - vendor
 #    - $HOME/.composer/cache
 
-before_install:
-  - echo "memory_limit=2G" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
-
 install:
   - |
     if [[ $TRAVIS_PHP_VERSION != '7.1' && $TRAVIS_PHP_VERSION != hhv* ]]; then
@@ -34,7 +31,7 @@ install:
   - travis_retry composer self-update && composer --version
   - travis_retry composer global require "fxp/composer-asset-plugin:^1.4.0"
   - export PATH="$HOME/.composer/vendor/bin:$PATH"
-  - travis_retry composer install --prefer-dist --no-interaction
+  - COMPOSER_MEMORY_LIMIT=-1 travis_retry composer install --prefer-dist --no-interaction
 
 before_script:
   - php -r "echo INTL_ICU_VERSION . \"\n\";"