diff --git a/wagtail/wagtailadmin/static/wagtailadmin/scss/layouts/page-editor.scss b/wagtail/wagtailadmin/static/wagtailadmin/scss/layouts/page-editor.scss
index 061995fbd..bf42743da 100644
--- a/wagtail/wagtailadmin/static/wagtailadmin/scss/layouts/page-editor.scss
+++ b/wagtail/wagtailadmin/static/wagtailadmin/scss/layouts/page-editor.scss
@@ -181,6 +181,10 @@
     &.stream-field {
         padding:0;
 
+        label{
+            text-transform:capitalize;
+        }
+
         &.required .field > label:after{
             display:none;
         }