diff --git a/packages/ai/src/prompt/convert-to-language-model-prompt.ts b/packages/ai/src/prompt/convert-to-language-model-prompt.ts
index 2ba5713c53a0..dd2d67dc317d 100644
--- a/packages/ai/src/prompt/convert-to-language-model-prompt.ts
+++ b/packages/ai/src/prompt/convert-to-language-model-prompt.ts
@@ -420,7 +420,7 @@ async function downloadAssets(
 
     .filter(
       (part): part is { mediaType: string | undefined; data: URL } =>
-        part.data instanceof URL,
+        part.data instanceof URL && part.data.protocol !== 'data:',
     )
     .map(part => ({
       url: part.data,