diff --git a/.changeset/stupid-pants-press.md b/.changeset/stupid-pants-press.md
new file mode 100644
index 0000000000..61fc33f0d4
--- /dev/null
+++ b/.changeset/stupid-pants-press.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Ensure that `injectRoute` is properly detected in monorepos and from node_modules