diff --git a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
index 789bbcf..203c72a 100644
--- a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
+++ b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
@@ -205,7 +205,7 @@ public function save(array $form, FormStateInterface $form_state) {
             );
             $responsive_image_style->addImageStyleMapping($breakpoint_id, $multiplier, $mapping);
           }
-          else if ($image_style_mapping['image_mapping_type'] === 'image_style') {
+          elseif ($image_style_mapping['image_mapping_type'] === 'image_style') {
             $mapping = array(
               'image_mapping_type' => 'image_style',
               'image_mapping' => $image_style_mapping['image_style'],