diff --git a/src/injectCaller.js b/src/injectCaller.js
index f35903b9..9ee10e03 100644
--- a/src/injectCaller.js
+++ b/src/injectCaller.js
@@ -11,6 +11,11 @@ module.exports = function injectCaller(opts) {
         // Webpack >= 2 supports ESM and dynamic import.
         supportsStaticESM: true,
         supportsDynamicImport: true,
+
+        // Webpack 5 supports TLA behind a flag. We enable it by default
+        // for Babel, and then webpack will throw an error if the experimental
+        // flag isn't enabled.
+        supportsTopLevelAwait: true,
       },
       opts.caller,
     ),