diff --git a/build/build-preload.php b/build/build-preload.php
index 8129619832f..cac10bc1e87 100755
--- a/build/build-preload.php
+++ b/build/build-preload.php
@@ -51,11 +51,28 @@ final class PreloadBuilder
 
 declare(strict_types=1);
 
+use PhpParser\Node;
+use PHPStan\Testing\PHPStanTestCase;
+
 if (defined('__PHPSTAN_RUNNING__')) {
     return;
 }
 
+// edge case during Rector tests case, happens when
+// 1. phpstan autoload test case is triggered first,
+// 2. all php-parser classes are loaded,
+if (defined('PHPUNIT_COMPOSER_INSTALL') && isPHPStanTestPreloaded()) {
+    return;
+}
 
+function isPHPStanTestPreloaded(): bool
+{
+    if (! class_exists(PHPStanTestCase::class, false)) {
+        return false;
+    }
+
+    return interface_exists(Node::class, false);
+}
 CODE_SAMPLE;
 
     /**
diff --git a/ecs.php b/ecs.php
index 0497edc8d5b..1ab742fc29d 100644
--- a/ecs.php
+++ b/ecs.php
@@ -24,6 +24,9 @@
         '*/Fixture/*',
         '*/Expected/*',
 
+        // avoid re-running on build
+        __DIR__ . '/preload.php',
+
         PhpdocTypesFixer::class => [
             // double to Double false positive
             __DIR__ . '/rules/Php74/Rector/Double/RealToFloatTypeCastRector.php',
diff --git a/preload-split-package.php b/preload-split-package.php
index 7da50430478..b014aa1f698 100644
--- a/preload-split-package.php
+++ b/preload-split-package.php
@@ -2,11 +2,28 @@
 
 declare(strict_types=1);
 
+use PhpParser\Node;
+use PHPStan\Testing\PHPStanTestCase;
+
 if (defined('__PHPSTAN_RUNNING__')) {
     return;
 }
 
-require_once __DIR__ . '/../../../vendor/nikic/php-parser/lib/PhpParser/Node.php';
+// edge case during Rector tests case, happens when
+// 1. phpstan autoload test case is triggered first,
+// 2. all php-parser classes are loaded,
+if (defined('PHPUNIT_COMPOSER_INSTALL') && isPHPStanTestPreloaded()) {
+    return;
+}
+
+function isPHPStanTestPreloaded(): bool
+{
+    if (! class_exists(PHPStanTestCase::class, false)) {
+        return false;
+    }
+
+    return interface_exists(Node::class, false);
+}require_once __DIR__ . '/../../../vendor/nikic/php-parser/lib/PhpParser/Node.php';
 require_once __DIR__ . '/src/Contract/PhpParser/Node/StmtsAwareInterface.php';
 require_once __DIR__ . '/../../../vendor/nikic/php-parser/lib/PhpParser/NodeAbstract.php';
 require_once __DIR__ . '/../../../vendor/nikic/php-parser/lib/PhpParser/Node/Expr.php';
diff --git a/preload.php b/preload.php
index ff3df4b2673..0e8f2828f72 100644
--- a/preload.php
+++ b/preload.php
@@ -2,11 +2,28 @@
 
 declare(strict_types=1);
 
+use PhpParser\Node;
+use PHPStan\Testing\PHPStanTestCase;
+
 if (defined('__PHPSTAN_RUNNING__')) {
     return;
 }
 
-require_once __DIR__ . '/vendor/nikic/php-parser/lib/PhpParser/Node.php';
+// edge case during Rector tests case, happens when
+// 1. phpstan autoload test case is triggered first,
+// 2. all php-parser classes are loaded,
+if (defined('PHPUNIT_COMPOSER_INSTALL') && isPHPStanTestPreloaded()) {
+    return;
+}
+
+function isPHPStanTestPreloaded(): bool
+{
+    if (! class_exists(PHPStanTestCase::class, false)) {
+        return false;
+    }
+
+    return interface_exists(Node::class, false);
+}require_once __DIR__ . '/vendor/nikic/php-parser/lib/PhpParser/Node.php';
 require_once __DIR__ . '/src/Contract/PhpParser/Node/StmtsAwareInterface.php';
 require_once __DIR__ . '/vendor/nikic/php-parser/lib/PhpParser/NodeAbstract.php';
 require_once __DIR__ . '/vendor/nikic/php-parser/lib/PhpParser/Node/Expr.php';
diff --git a/src/BetterPhpDocParser/PhpDocManipulator/PhpDocTypeChanger.php b/src/BetterPhpDocParser/PhpDocManipulator/PhpDocTypeChanger.php
index 8cb0abd62bc..4a4df6812cf 100644
--- a/src/BetterPhpDocParser/PhpDocManipulator/PhpDocTypeChanger.php
+++ b/src/BetterPhpDocParser/PhpDocManipulator/PhpDocTypeChanger.php
@@ -7,7 +7,6 @@
 use PhpParser\Node\FunctionLike;
 use PhpParser\Node\Param;
 use PhpParser\Node\Stmt;
-use PhpParser\Node\Stmt\ClassMethod;
 use PHPStan\PhpDocParser\Ast\ConstExpr\ConstFetchNode;
 use PHPStan\PhpDocParser\Ast\Node;
 use PHPStan\PhpDocParser\Ast\PhpDoc\ParamTagValueNode;