diff --git a/src/module.ts b/src/module.ts
index 3aaa50e..cd51522 100644
--- a/src/module.ts
+++ b/src/module.ts
@@ -104,7 +104,7 @@ export default defineNuxtModule<ModuleOptions>({
 
     nuxt.options.build.transpile.push(runtimeDir)
     nuxt.options.vite.define['process.env.DEBUG'] =
-      nuxt.options.debug.toString()
+      Boolean(nuxt.options.debug).toString()
 
     for (const fname of ['default']) {
       const path = resolve(runtimeDir, nuxt.options.dir.layouts, `${fname}.vue`)