diff --git a/composer.json b/composer.json
index 1f23bca..3301d5e 100644
--- a/composer.json
+++ b/composer.json
@@ -47,7 +47,8 @@
             "LanguageServer\\": "src/"
         },
         "files" : [
-            "src/utils.php"
+            "src/utils.php",
+            "src/bootstrap.php"
         ]
     },
     "autoload-dev": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 6cd8787..0dee3d6 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="vendor/autoload.php">
+<phpunit bootstrap="src/bootstrap.php">
     <testsuites>
         <testsuite name="PHP Language Server Test Suite">
             <directory>./tests</directory>
diff --git a/src/bootstrap.php b/src/bootstrap.php
new file mode 100644
index 0000000..455f7dc
--- /dev/null
+++ b/src/bootstrap.php
@@ -0,0 +1,5 @@
+<?php
+
+// PHP_CodeSniffer does not define an autoloader in its composer.json,
+// so we must invoke it ourselves.
+require __DIR__ . "/../vendor/squizlabs/php_codesniffer/autoload.php";