diff --git a/Tests/TestClient.php b/Tests/TestClient.php
index c98c650..47c76ad 100644
--- a/Tests/TestClient.php
+++ b/Tests/TestClient.php
@@ -41,7 +41,7 @@ protected function doRequest(object $request): Response
         return $response;
     }
 
-    protected function getScript(object $request)
+    protected function getScript(object $request): string
     {
         $r = new \ReflectionClass(Response::class);
         $path = $r->getFileName();
diff --git a/Tests/TestHttpClient.php b/Tests/TestHttpClient.php
index afb0197..7a3c9a7 100644
--- a/Tests/TestHttpClient.php
+++ b/Tests/TestHttpClient.php
@@ -64,7 +64,7 @@ protected function doRequest(object $request): Response
         return $response;
     }
 
-    protected function getScript(object $request)
+    protected function getScript(object $request): string
     {
         $r = new \ReflectionClass(Response::class);
         $path = $r->getFileName();