diff --git a/destyle.css b/destyle.css
index 318223e..9c98f9c 100644
--- a/destyle.css
+++ b/destyle.css
@@ -109,7 +109,7 @@ hr {
   height: 0; /* 1 */
   overflow: visible; /* 2 */
   border: 0;
-  border-top: 1px;
+  border-top-width: 1px;
   margin: 0;
   clear: both;
   color: inherit;