diff --git a/packages/markdown/remark/src/remark-prism.ts b/packages/markdown/remark/src/remark-prism.ts
index 9ac72ea0f..d8dd8d922 100644
--- a/packages/markdown/remark/src/remark-prism.ts
+++ b/packages/markdown/remark/src/remark-prism.ts
@@ -12,7 +12,7 @@ function runHighlighter(lang: string, code: string) {
   let classLanguage = `language-${lang}`
 
   if (lang == null) {
-    console.warn('Prism.astro: No language provided.');
+    lang = 'plaintext';
   }
 
   const ensureLoaded = (lang: string) => {