diff --git a/.babelrc-deno.json b/.babelrc-deno.json
index 561f7347be..4b9b17ddad 100644
--- a/.babelrc-deno.json
+++ b/.babelrc-deno.json
@@ -1,7 +1,7 @@
 {
   "plugins": [
     "@babel/plugin-transform-flow-strip-types",
-    ["./resources/add-extension-to-import-paths", { "extension": "mjs" }],
+    ["./resources/add-extension-to-import-paths", { "extension": "js" }],
     "./resources/inline-invariant"
   ],
   "overrides": [