diff --git a/theme/boost/templates/core_form/element-advcheckbox-inline.mustache b/theme/boost/templates/core_form/element-advcheckbox-inline.mustache
index 918f272be0d..d22db820e37 100644
--- a/theme/boost/templates/core_form/element-advcheckbox-inline.mustache
+++ b/theme/boost/templates/core_form/element-advcheckbox-inline.mustache
@@ -7,7 +7,7 @@
         <input type="hidden" name="{{element.name}}" value="{{element.frozenvalue}}">
     {{/element.frozen}}
 {{/element.hardfrozen}}
-<input type="checkbox" name="{{element.name}}"
+<input type="checkbox" name="{{element.name}}" class="{{element.extraclasses}}"
     id="{{element.id}}"
     {{#element.selectedvalue}}
         value="{{element.selectedvalue}}"
diff --git a/theme/boost/templates/core_form/element-advcheckbox.mustache b/theme/boost/templates/core_form/element-advcheckbox.mustache
index a6cb35ce287..8ec8fe9f83c 100644
--- a/theme/boost/templates/core_form/element-advcheckbox.mustache
+++ b/theme/boost/templates/core_form/element-advcheckbox.mustache
@@ -18,6 +18,7 @@
         {{/element.hardfrozen}}
         <input type="checkbox"
             name="{{element.name}}"
+            class="{{element.extraclasses}}"
             {{#element.selectedvalue}}
                 value="{{element.selectedvalue}}"
             {{/element.selectedvalue}}
diff --git a/theme/boost/templates/core_form/element-checkbox-inline.mustache b/theme/boost/templates/core_form/element-checkbox-inline.mustache
index 8e098f049fc..150d2a01dac 100644
--- a/theme/boost/templates/core_form/element-checkbox-inline.mustache
+++ b/theme/boost/templates/core_form/element-checkbox-inline.mustache
@@ -4,7 +4,7 @@
         <input type="hidden" name="{{element.name}}" value="{{element.frozenvalue}}">
     {{/element.frozen}}
 {{/element.hardfrozen}}
-<input type="checkbox" name="{{element.name}}"
+<input type="checkbox" name="{{element.name}}" class="{{element.extraclasses}}"
     id="{{element.id}}"
     {{#element.value}}
         value="{{element.value}}"
diff --git a/theme/boost/templates/core_form/element-checkbox.mustache b/theme/boost/templates/core_form/element-checkbox.mustache
index 3a63cc43a2b..ad55331f586 100644
--- a/theme/boost/templates/core_form/element-checkbox.mustache
+++ b/theme/boost/templates/core_form/element-checkbox.mustache
@@ -15,6 +15,7 @@
         {{/element.hardfrozen}}
         <input type="checkbox"
             name="{{element.name}}"
+            class="{{element.extraclasses}}"
             {{#element.value}}
                 value="{{element.value}}"
             {{/element.value}}