diff --git a/web/ui/react-app/.env b/web/ui/react-app/.env
new file mode 100644
index 000000000..b4cad0c00
--- /dev/null
+++ b/web/ui/react-app/.env
@@ -0,0 +1,3 @@
+# This ensures that all links in the generated asset bundle will be relative,
+# so that assets are loaded correctly even when a path prefix is used.
+PUBLIC_URL=.