diff --git a/packages/nuxt/src/app/composables/fetch.ts b/packages/nuxt/src/app/composables/fetch.ts
index 0ff307c23..2d52a096e 100644
--- a/packages/nuxt/src/app/composables/fetch.ts
+++ b/packages/nuxt/src/app/composables/fetch.ts
@@ -26,8 +26,8 @@ export function useFetch<
   request: Ref<ReqT> | ReqT | (() => ReqT),
   opts: UseFetchOptions<_ResT, Transform, PickKeys> = {}
 ) {
-  if (process.dev && opts.transform && !opts.key) {
-    console.warn('[nuxt] You should provide a key for `useFetch` when using a custom transform function.')
+  if (process.dev && !opts.key && Object.values(opts).some(v => typeof v === 'function' || v instanceof Blob)) {
+    console.warn('[nuxt] [useFetch] You should provide a key when passing options that are not serializable to JSON:', opts)
   }
   const key = '$f_' + (opts.key || hash([request, { ...opts, transform: null }]))
   const _request = computed(() => {