diff --git a/src/index.html.ejs b/src/index.html.ejs
index 1c6690f6..592c35c9 100644
--- a/src/index.html.ejs
+++ b/src/index.html.ejs
@@ -24,6 +24,7 @@
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
   <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Noto+Sans:ital,wght@0,100..900;1,100..900&display=swap">
+  <link rel="preload" href="data/basic.json" as="fetch">
   <title>Interslavic Dictionary</title>
   <meta name="Description"
         content="It is a dictionary of the Interslavic language with translations into most of the Slavic languages, as well as into English, German and others. The project is being developed by a community of fans of this zonal constructed language.">