diff --git a/.travis.yml b/.travis.yml
index c92e2b88..508f6654 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,7 +11,6 @@ php:
     - 5.6
     - 7.0
     - 7.1
-    - hhvm
 
 env:
     - TEST_COMMAND="composer test"
@@ -27,6 +26,8 @@ matrix:
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" COVERAGE=true TEST_COMMAND="composer test-ci"
         - php: 7.1
           env: DEPENDENCIES=dev
+        - php: hhvm
+          dist: trusty
           # Test against LTS versions
         - php: 7.0
           env: SYMFONY_VERSION=2.8.*
diff --git a/Tests/Unit/Collector/FormatterTest.php b/Tests/Unit/Collector/FormatterTest.php
index 0d18c9e3..ecc31582 100644
--- a/Tests/Unit/Collector/FormatterTest.php
+++ b/Tests/Unit/Collector/FormatterTest.php
@@ -82,10 +82,7 @@ public function testFormatHttpException()
 
     public function testFormatTransferException()
     {
-        $exception = $this->getMockBuilder(TransferException::class)
-            ->setConstructorArgs(['ExceptionMessage'])
-            ->getMock()
-        ;
+        $exception = new TransferException('ExceptionMessage');
 
         $this->assertEquals('Transfer error: ExceptionMessage', $this->subject->formatException($exception));
     }