diff --git a/src/shared/api-schemas/anthropic.ts b/src/shared/api-schemas/anthropic.ts
index 693f6f7..aa077f3 100644
--- a/src/shared/api-schemas/anthropic.ts
+++ b/src/shared/api-schemas/anthropic.ts
@@ -66,7 +66,7 @@ export const AnthropicV1MessagesSchema = AnthropicV1BaseSchema.merge(
     system: z
       .union([
         z.string(),
-        z.array(z.object({ type: z.literal("string"), text: z.string() })),
+        z.array(z.object({ type: z.literal("text"), text: z.string() })),
       ])
       .optional(),
   })