diff --git a/core/modules/system/src/Plugin/ImageToolkit/GDToolkit.php b/core/modules/system/src/Plugin/ImageToolkit/GDToolkit.php
index 6da7a6f..5619535 100644
--- a/core/modules/system/src/Plugin/ImageToolkit/GDToolkit.php
+++ b/core/modules/system/src/Plugin/ImageToolkit/GDToolkit.php
@@ -244,7 +244,12 @@ public function save($destination) {
         imagealphablending($this->getResource(), FALSE);
         imagesavealpha($this->getResource(), TRUE);
       }
-      $success = $function($this->getResource(), $destination);
+      if ($function === 'imagewebp') {
+        $success = $function($this->getResource(), $destination, 100);
+      }
+      else {
+        $success = $function($this->getResource(), $destination);
+      }
     }
     // Move temporary local file to remote destination.
     if (isset($permanent_destination) && $success) {
diff --git a/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php b/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php
index 2fae80f..128b606 100644
--- a/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php
+++ b/core/tests/Drupal/KernelTests/Core/Image/ToolkitGdTest.php
@@ -78,7 +78,7 @@ protected function buildWebpTestImage() {
     imagefilledrectangle($res, 20, 10, 39, 19, $blue);
     imagefilledrectangle($res, 0, 10, 19, 19, $yellow_transparent);
     imagesavealpha($res, TRUE);
-    imagewebp($res, Settings::get('file_public_path') . '/sourceimagetest/img-test.webp');
+    imagewebp($res, Settings::get('file_public_path') . '/sourceimagetest/img-test.webp', 100);
   }
 
   /**