diff --git a/src/Conversions/FileManipulator.php b/src/Conversions/FileManipulator.php
index 75661c646..c7141ea69 100644
--- a/src/Conversions/FileManipulator.php
+++ b/src/Conversions/FileManipulator.php
@@ -100,7 +100,7 @@ protected function dispatchQueuedConversions(
         return $this;
     }
 
-    protected function generateResponsiveImages(Media $media, bool $withResponsiveImages)
+    protected function generateResponsiveImages(Media $media, bool $withResponsiveImages): self
     {
         if (! $withResponsiveImages) {
             return $this;