diff --git a/README.md b/README.md
index 582e0a6..547a89c 100644
--- a/README.md
+++ b/README.md
@@ -54,15 +54,21 @@ This is a PHP 7.1+ rule:
 
 We assume that [PHPStan](https://github.com/phpstan/phpstan) is already installed in your project.
 
-Let's add this package:
+To use this extension, require it in [Composer](https://getcomposer.org/):
 
 ```bash
 composer require --dev thecodingmachine/phpstan-strict-rules
 ```
 
-Now, edit your `phpstan.neon` file and add these rules:
+If you also install [phpstan/extension-installer](https://github.com/phpstan/extension-installer) then you're all set!
+
+<details>
+  <summary>Manual installation</summary>
+
+If you don't want to use `phpstan/extension-installer`, include phpstan-strict-rules.neon in your project's PHPStan config:
 
 ```yml
 includes:
     - vendor/thecodingmachine/phpstan-strict-rules/phpstan-strict-rules.neon
 ```
+</details>
diff --git a/composer.json b/composer.json
index 188f1c9..cac6e1a 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,7 @@
     ],
     "require": {
         "php": "^7.1",
-        "phpstan/phpstan": "^0.10|^0.11"
+        "phpstan/phpstan": "^0.11.7"
     },
     "require-dev": {
         "phpunit/phpunit": "^7.1",
@@ -37,6 +37,11 @@
     "extra": {
         "branch-alias": {
             "dev-master": "0.10-dev"
+        },
+        "phpstan": {
+            "includes": [
+                "phpstan-strict-rules.neon"
+            ]
         }
     }
 }
diff --git a/src/Rules/TypeHints/AbstractMissingTypeHintRule.php b/src/Rules/TypeHints/AbstractMissingTypeHintRule.php
index 1fd3f36..1abf228 100644
--- a/src/Rules/TypeHints/AbstractMissingTypeHintRule.php
+++ b/src/Rules/TypeHints/AbstractMissingTypeHintRule.php
@@ -69,11 +69,13 @@ public function processNode(Node $node, Scope $scope): array
         $errors = [];
 
         foreach ($parametersAcceptor->getParameters() as $parameter) {
-            $debugContext = new ParameterDebugContext($scope, $node, $parameter);
-            $result = $this->analyzeParameter($debugContext, $parameter);
+            if ($parameter instanceof PhpParameterReflection) {
+                $debugContext = new ParameterDebugContext($scope, $node, $parameter);
+                $result = $this->analyzeParameter($debugContext, $parameter);
 
-            if ($result !== null) {
-                $errors[] = $result;
+                if ($result !== null) {
+                    $errors[] = $result;
+                }
             }
         }