diff --git a/aio/src/index.html b/aio/src/index.html
index ab1598d84d..be6e88d5e3 100644
--- a/aio/src/index.html
+++ b/aio/src/index.html
@@ -20,9 +20,9 @@
   <link rel="apple-touch-icon-precomposed" sizes="144x144" href="assets/images/favicons/favicon-144x144.png">
 
   <!-- NOTE: These need to be kept in sync with `ngsw-config.json`. -->
-  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500">
-  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Droid+Sans+Mono">
-  <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
+  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500&display=swap">
+  <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Droid+Sans+Mono&display=swap">
+  <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons&display=block">
   <!-- -->
 
   <link rel="manifest" href="pwa-manifest.json">