diff --git a/themes/base/theme.css b/themes/base/theme.css
index bb097bf29..80d1128a4 100644
--- a/themes/base/theme.css
+++ b/themes/base/theme.css
@@ -220,7 +220,7 @@ a.ui-button:active,
 }
 
 /* positioning */
-.ui-icon-blank { background-position: 16px 16px; }
+html .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; }