diff --git a/.travis.yml b/.travis.yml
index fa8998cec1..18017cebc5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -41,7 +41,7 @@ before_install:
   fi
 - |
   if [[ "$WP_TRAVIS_OBJECT_CACHE" == "true" ]]; then
-    curl https://raw.githubusercontent.com/tollmanz/wordpress-pecl-memcached-object-cache/master/object-cache.php > src/wp-content/object-cache.php
+    curl https://raw.githubusercontent.com/tollmanz/wordpress-pecl-memcached-object-cache/584392b56dc4adbe52bd2c7b86f875e23a3e5f75/object-cache.php > src/wp-content/object-cache.php
     echo "extension = memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   fi
 before_script: