diff --git a/src/Internal/ContainerDynamicReturnTypeExtension.php b/build/PHPStan/Build/ContainerDynamicReturnTypeExtension.php
similarity index 98%
rename from src/Internal/ContainerDynamicReturnTypeExtension.php
rename to build/PHPStan/Build/ContainerDynamicReturnTypeExtension.php
index 0fc017e67f..8e43bd2d47 100644
--- a/src/Internal/ContainerDynamicReturnTypeExtension.php
+++ b/build/PHPStan/Build/ContainerDynamicReturnTypeExtension.php
@@ -1,6 +1,6 @@
 <?php declare(strict_types = 1);
 
-namespace PHPStan\Internal;
+namespace PHPStan\Build;
 
 use PhpParser\Node\Expr\MethodCall;
 use PHPStan\Analyser\Scope;
diff --git a/build/phpstan.neon b/build/phpstan.neon
index 95526db694..86610dc028 100644
--- a/build/phpstan.neon
+++ b/build/phpstan.neon
@@ -108,6 +108,6 @@ services:
 		tags:
 			- phpstan.broker.dynamicMethodReturnTypeExtension
 	-
-		class: PHPStan\Internal\ContainerDynamicReturnTypeExtension
+		class: PHPStan\Build\ContainerDynamicReturnTypeExtension
 		tags:
 			- phpstan.broker.dynamicMethodReturnTypeExtension
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 1a784df8d7..81b6bc27c6 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -162,7 +162,7 @@ parameters:
 		-
 			message: "#^Doing instanceof PHPStan\\\\Type\\\\Constant\\\\ConstantStringType is error\\-prone and deprecated\\. Use Type\\:\\:getConstantStrings\\(\\) instead\\.$#"
 			count: 1
-			path: src/Internal/ContainerDynamicReturnTypeExtension.php
+			path: build/PHPStan/Build/ContainerDynamicReturnTypeExtension.php
 
 		-
 			message: "#^Variable method call on PHPStan\\\\Reflection\\\\ClassReflection\\.$#"