diff --git a/packages/vite-plugin-nitro/src/lib/plugins/dev-server-plugin.ts b/packages/vite-plugin-nitro/src/lib/plugins/dev-server-plugin.ts
index 090747a7c..66987eeb6 100644
--- a/packages/vite-plugin-nitro/src/lib/plugins/dev-server-plugin.ts
+++ b/packages/vite-plugin-nitro/src/lib/plugins/dev-server-plugin.ts
@@ -44,6 +44,7 @@ export function devServerPlugin(options: ServerOptions): Plugin {
               await viteServer.ssrLoadModule('~analog/entry-server')
             )['default'];
             const result = await entryServer(req.originalUrl, template);
+            res.setHeader('Content-Type', 'text/html');
             res.end(result);
           } catch (e) {
             viteServer && viteServer.ssrFixStacktrace(e as Error);