diff --git a/src/librustdoc/html/static/rustdoc.css b/src/librustdoc/html/static/rustdoc.css
index 567c8fb97180e..9314f57359ace 100644
--- a/src/librustdoc/html/static/rustdoc.css
+++ b/src/librustdoc/html/static/rustdoc.css
@@ -691,7 +691,7 @@ span.since {
 	margin-bottom: 25px;
 }
 
-.enum .variant, .struct .structfield {
+.enum .variant, .struct .structfield, .union .structfield {
 	display: block;
 }