diff --git a/ts/bundle_svelte.mjs b/ts/bundle_svelte.mjs
index ffdc7591f..c4f891b3e 100644
--- a/ts/bundle_svelte.mjs
+++ b/ts/bundle_svelte.mjs
@@ -54,7 +54,7 @@ build({
     plugins: [
         sassPlugin({ loadPaths: [".", "node_modules"] }),
         sveltePlugin({
-            compilerOptions: { css: inlineCss },
+            compilerOptions: { css: inlineCss ? "injected" : "external" },
             preprocess: sveltePlugins,
             // let us focus on errors; we can see the warnings with svelte-check
             filterWarnings: (_warning) => false,