diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 71e7ffcb92..762bb36b8e 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -22,6 +22,7 @@ Changelog
  * Fix: Migration for addition of `Page.draft_title` field is now reversible (Venelin Stoykov)
  * Fix: Fixed failure on application startup when `ManifestStaticFilesStorage` is in use and `collectstatic` has not yet been run (Matt Westcott)
  * Fix: Fixed handling of Vimeo and other oEmbed providers with a format parameter in the endpoint URL (Mitchel Cabuloy)
+ * Fix: Fixed regression in rendering save button in wagtail.contrib.settings edit view (Matt Westcott)
 
 
 1.12.1 (30.08.2017)
diff --git a/docs/releases/1.12.2.rst b/docs/releases/1.12.2.rst
index 99ad80784f..e46039ec1e 100644
--- a/docs/releases/1.12.2.rst
+++ b/docs/releases/1.12.2.rst
@@ -16,3 +16,4 @@ Bug fixes
  * Migration for addition of ``Page.draft_title`` field is now reversible (Venelin Stoykov)
  * Fixed failure on application startup when ``ManifestStaticFilesStorage`` is in use and ``collectstatic`` has not yet been run (Matt Westcott)
  * Fixed handling of Vimeo and other oEmbed providers with a format parameter in the endpoint URL (Mitchel Cabuloy)
+ * Fixed regression in rendering save button in wagtail.contrib.settings edit view (Matt Westcott)
diff --git a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/core.scss b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/core.scss
index 2fafc87b2b..dec76933af 100644
--- a/wagtail/wagtailadmin/static_src/wagtailadmin/scss/core.scss
+++ b/wagtail/wagtailadmin/static_src/wagtailadmin/scss/core.scss
@@ -142,6 +142,10 @@ footer {
         margin-right: $grid-gutter-width / 2;
     }
 
+    .preview .dropdown {
+        width: 250px;
+    }
+
     .meta {
         float: right;
         text-align: right;
@@ -165,7 +169,8 @@ footer {
 
     @media screen and (max-width: $breakpoint-mobile) {
         .actions,
-        .preview {
+        .preview,
+        .preview .dropdown {
             width: 100%;
         }