diff --git a/packages/client-fetch/src/types.ts b/packages/client-fetch/src/types.ts
index ff1f5270f..1a3eb3ebc 100644
--- a/packages/client-fetch/src/types.ts
+++ b/packages/client-fetch/src/types.ts
@@ -24,8 +24,7 @@ export interface Config<ThrowOnError extends boolean = boolean>
     | Record<string, unknown>
     | Array<Record<string, unknown>>
     | Array<unknown>
-    | number
-    | unknown;
+    | number;
   /**
    * A function for serializing request body parameter. By default,
    * {@link JSON.stringify()} will be used.