diff --git a/.changeset/clever-phones-reply.md b/.changeset/clever-phones-reply.md
new file mode 100644
index 000000000000..156658340954
--- /dev/null
+++ b/.changeset/clever-phones-reply.md
@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+fix: silence dev/prod warning during sync
diff --git a/packages/kit/src/utils/routing.js b/packages/kit/src/utils/routing.js
index 7d988317a058..19eef5b265c3 100644
--- a/packages/kit/src/utils/routing.js
+++ b/packages/kit/src/utils/routing.js
@@ -1,4 +1,5 @@
-import { BROWSER } from 'esm-env';
+// @ts-ignore - need to publish types for sub-package imports
+import BROWSER from 'esm-env/browser';
 
 const param_pattern = /^(\[)?(\.\.\.)?(\w+)(?:=(\w+))?(\])?$/;