diff --git a/lib/rdoc/generator/template/darkfish/css/rdoc.css b/lib/rdoc/generator/template/darkfish/css/rdoc.css
index ddaf4d47c6530d..f845d6cecba0bd 100644
--- a/lib/rdoc/generator/template/darkfish/css/rdoc.css
+++ b/lib/rdoc/generator/template/darkfish/css/rdoc.css
@@ -567,7 +567,7 @@ main .method-click-advice {
   line-height: 20px;
   background: url(../images/zoom.png) no-repeat right top;
 }
-main .method-heading:hover .method-click-advice {
+main .method-header:hover .method-click-advice {
   visibility: visible;
 }