diff --git a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
index d97fd2a..789bbcf 100644
--- a/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
+++ b/core/modules/responsive_image/src/ResponsiveImageStyleForm.php
@@ -195,7 +195,7 @@ public function save(array $form, FormStateInterface $form_state) {
     if ($form_state->hasValue('keyed_styles')) {
       foreach ($form_state->getValue('keyed_styles') as $breakpoint_id => $multipliers) {
         foreach ($multipliers as $multiplier => $image_style_mapping) {
-          if ($image_style_mapping['image_mapping_type'] == 'sizes') {
+          if ($image_style_mapping['image_mapping_type'] === 'sizes') {
             $mapping = array(
               'image_mapping_type' => 'sizes',
               'image_mapping' => array(
@@ -205,10 +205,10 @@ 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') {
+          else if ($image_style_mapping['image_mapping_type'] === 'image_style') {
             $mapping = array(
               'image_mapping_type' => 'image_style',
-              'image_mapping' => $image_style_mapping['image_style']
+              'image_mapping' => $image_style_mapping['image_style'],
             );
             $responsive_image_style->addImageStyleMapping($breakpoint_id, $multiplier, $mapping);
           }