diff --git a/wagtail/wagtailadmin/static/wagtailadmin/scss/components/icons.scss b/wagtail/wagtailadmin/static/wagtailadmin/scss/components/icons.scss
index 9659a6695..3519df582 100644
--- a/wagtail/wagtailadmin/static/wagtailadmin/scss/components/icons.scss
+++ b/wagtail/wagtailadmin/static/wagtailadmin/scss/components/icons.scss
@@ -201,7 +201,7 @@
 .icon-horizontalrule{
     &:before{
         font-family: Open Sans,Arial,sans-serif !important; // FML
-        content:"-";
+        content:"\2014";
     }
 }
 .icon-password:before{