diff --git a/skins/elastic/styles/widgets/buttons.less b/skins/elastic/styles/widgets/buttons.less
index 219898415..2ad57c9bf 100644
--- a/skins/elastic/styles/widgets/buttons.less
+++ b/skins/elastic/styles/widgets/buttons.less
@@ -144,6 +144,9 @@ button.btn {
     &.sign:before {
         content: @fa-var-signature;
     }
+    &.sso:before {
+        content: @fa-var-sign-in-alt;
+    }
 }
 
 a.btn,