diff --git a/packages/docusaurus-theme-classic/src/index.js b/packages/docusaurus-theme-classic/src/index.js
index 0007b1b05d..0f09eab682 100644
--- a/packages/docusaurus-theme-classic/src/index.js
+++ b/packages/docusaurus-theme-classic/src/index.js
@@ -63,9 +63,12 @@ module.exports = function(context, options) {
         return {};
       }
       return {
-        headTags: [
+        preBodyTags: [
           {
             tagName: 'script',
+            attributes: {
+              type: 'text/javascript',
+            },
             innerHTML: noFlash,
           },
         ],