diff --git a/phpstan-for-rector.neon b/phpstan-for-rector.neon
index ebe9b002eea..c093e6cdff3 100644
--- a/phpstan-for-rector.neon
+++ b/phpstan-for-rector.neon
@@ -8,3 +8,9 @@ parameters:
     # see https://github.com/rectorphp/rector/issues/3490#issue-634342324
     featureToggles:
         disableRuntimeReflectionProvider: true
+
+# load extension
+includes:
+    - vendor/phpstan/phpstan-webmozart-assert/extension.neon
+    - vendor/phpstan/phpstan-phpunit/extension.neon
+    - vendor/phpstan/phpstan-nette/extension.neon