diff --git a/src/module.ts b/src/module.ts
index 3b973314..34f0c654 100644
--- a/src/module.ts
+++ b/src/module.ts
@@ -85,7 +85,7 @@ export default defineNuxtModule<ModuleOptions>({
 
     async function registerModule(name: string, key: string, options: Record<string, any>) {
       if (!hasNuxtModule(name)) {
-        await installModule(name, options)
+        await installModule(name, defu((nuxt.options as any)[key], options))
       } else {
         (nuxt.options as any)[key] = defu((nuxt.options as any)[key], options)
       }