diff --git a/config/block.block.octavia_tourratesfooterblock.yml b/config/block.block.octavia_tourratesfooterblock.yml
index e99055a..3a11817 100644
--- a/config/block.block.octavia_tourratesfooterblock.yml
+++ b/config/block.block.octavia_tourratesfooterblock.yml
@@ -12,7 +12,7 @@ dependencies:
     - octavia
 third_party_settings:
   block_class:
-    classes: 'image is-fullwidth'
+    classes: 'image is-fullwidth purge-child-class'
 id: octavia_tourratesfooterblock
 theme: octavia
 region: content_bottom
diff --git a/config/block_class.settings.yml b/config/block_class.settings.yml
index d9d1fa5..5b9f1c6 100644
--- a/config/block_class.settings.yml
+++ b/config/block_class.settings.yml
@@ -3,7 +3,7 @@ _core:
 maxlength_block_class_field: 255
 field_type: multiple_textfields
 default_case: standard
-block_classes_stored: '{"image":"image","is-fullwidth":"is-fullwidth"}'
+block_classes_stored: '{"image":"image","is-fullwidth":"is-fullwidth","purge-child-class":"purge-child-class"}'
 enable_attributes: true
 enable_auto_complete: true
 qty_classes_per_block: 10