diff --git a/styles/theme-medium.css b/styles/theme-medium.css
index 7bb0475473..3c8b1da577 100644
--- a/styles/theme-medium.css
+++ b/styles/theme-medium.css
@@ -117,6 +117,7 @@ h1.refname {
 .methodname strong,
 .methodname a,
 .classsynopsis .classname,
+.classsynopsis .interfacename,
 .parameter {
     color: #369;
 }