diff --git a/.changeset/spotty-islands-raise.md b/.changeset/spotty-islands-raise.md
new file mode 100644
index 000000000000..f8246006de12
--- /dev/null
+++ b/.changeset/spotty-islands-raise.md
@@ -0,0 +1,6 @@
+---
+'@astrojs/deno': patch
+'@astrojs/netlify': patch
+---
+
+Fix: append shim to top of built file to avoid "can't read process of undefined" issues