diff --git a/normalize.css b/normalize.css
index 192eb9c..eae8027 100644
--- a/normalize.css
+++ b/normalize.css
@@ -325,7 +325,7 @@ details {
  * Add the correct display in all browsers.
  */
 
-summary {
+details > summary:first-of-type {
   display: list-item;
 }