diff --git a/.travis.yml b/.travis.yml
index 011af3173b..cc4e8671f2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,7 +20,7 @@ env:
 matrix:
     include:
         # Use the newer stack for HHVM as HHVM does not support Precise anymore since a long time and so Precise has an outdated version
-        - php: hhvm-3.15
+        - php: hhvm-3.18
           sudo: required
           dist: trusty
           group: edge
diff --git a/README.md b/README.md
index 36a466f2c8..1ec5983c5c 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ Community
 ---------
 
 * [Join the Symfony Community][11] and meet other members at the [Symfony events][12].
-* [Get Symfony support][13] on StackOverflow, Slack, IRC, etc.
+* [Get Symfony support][13] on Stack Overflow, Slack, IRC, etc.
 * Follow us on [GitHub][14], [Twitter][15] and [Facebook][16].
 
 Contributing
diff --git a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/WebTestCase.php b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/WebTestCase.php
index 33da9028a3..da07116ae0 100644
--- a/src/Symfony/Bundle/SecurityBundle/Tests/Functional/WebTestCase.php
+++ b/src/Symfony/Bundle/SecurityBundle/Tests/Functional/WebTestCase.php
@@ -25,7 +25,7 @@ class WebTestCase extends BaseWebTestCase
 
     protected static function deleteTmpDir($testCase)
     {
-        if (!file_exists($dir = sys_get_temp_dir().'/'.Kernel::VERSION.'/'.$testCase)) {
+        if (defined('HHVM_VERSION_ID') || !file_exists($dir = sys_get_temp_dir().'/'.Kernel::VERSION.'/'.$testCase)) {
             return;
         }