diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index cc75380595..5e374cf94b 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -46,6 +46,7 @@ Changelog
  * Fix: Redirects no longer fail when both a site-specific and generic redirect exist for the same URL path (Nick Smith, João Luiz Lorencetti)
  * Fix: Wagtail now checks that Group is registered with the Django admin before unregistering it (Jason Morrison)
  * Fix: Previewing inaccessible pages no longer fails with `ALLOWED_HOSTS = ['*']` (Robert Rollins)
+ * Fix: The submit button 'spinner' no longer activates if the form has client-side validation errors (Jack Paine, Matt Westcott)
 
 
 1.4.3 (04.04.2016)
diff --git a/docs/releases/1.4.4.rst b/docs/releases/1.4.4.rst
index fa88390356..bf367fd989 100644
--- a/docs/releases/1.4.4.rst
+++ b/docs/releases/1.4.4.rst
@@ -20,3 +20,4 @@ Bug fixes
  * Redirects no longer fail when both a site-specific and generic redirect exist for the same URL path (Nick Smith, João Luiz Lorencetti)
  * Wagtail now checks that Group is registered with the Django admin before unregistering it (Jason Morrison)
  * Previewing inaccessible pages no longer fails with ``ALLOWED_HOSTS = ['*']`` (Robert Rollins)
+ * The submit button 'spinner' no longer activates if the form has client-side validation errors (Jack Paine, Matt Westcott)
diff --git a/wagtail/wagtailadmin/static_src/wagtailadmin/js/core.js b/wagtail/wagtailadmin/static_src/wagtailadmin/js/core.js
index 92d62e840c..5d7e593ae8 100644
--- a/wagtail/wagtailadmin/static_src/wagtailadmin/js/core.js
+++ b/wagtail/wagtailadmin/static_src/wagtailadmin/js/core.js
@@ -223,6 +223,13 @@ $(function() {
         var reEnableAfter = 30;
         var dataName = 'disabledtimeout'
 
+        // Check the form this submit button belongs to (if any)
+        var form = $self.closest('form').get(0);
+        if (form && form.checkValidity && (form.checkValidity() == false)) {
+                 // ^ Check form.checkValidity returns something as it may not be browser compatible
+            return;
+        }
+
         // Disabling a button prevents it submitting the form, so disabling
         // must occur on a brief timeout only after this function returns.