diff --git a/themes/base/theme.css b/themes/base/theme.css
index ad6f5004b31..192624a11ff 100644
--- a/themes/base/theme.css
+++ b/themes/base/theme.css
@@ -220,7 +220,10 @@ a.ui-button:active,
 }
 
 /* positioning */
-html .ui-icon-blank { background-image: none; }
+/* Three classes needed to override `.ui-button:hover .ui-icon` */
+.ui-icon-blank.ui-icon-blank.ui-icon-blank {
+	background-image: none;
+}
 .ui-icon-caret-1-n { background-position: 0 0; }
 .ui-icon-caret-1-ne { background-position: -16px 0; }
 .ui-icon-caret-1-e { background-position: -32px 0; }