diff --git a/test/testapps/BasicTestApp/wwwroot/index.html b/test/testapps/BasicTestApp/wwwroot/index.html
index c0e976bb97..0aaa53b8ef 100644
--- a/test/testapps/BasicTestApp/wwwroot/index.html
+++ b/test/testapps/BasicTestApp/wwwroot/index.html
@@ -6,7 +6,7 @@
     <base href="/subdir/" />
 </head>
 <body>
-  <div id="test-selector" style="display: none">
+  <div id="test-selector" style="display: none;">
     Select test:
     <select onchange="mountTestComponent(event.target.value)">
       <option value="">Choose...</option>
