diff --git a/packages/ntcore-ts-client/src/lib/types/schemas.ts b/packages/ntcore-ts-client/src/lib/types/schemas.ts
index fa0fd32..f92fb30 100644
--- a/packages/ntcore-ts-client/src/lib/types/schemas.ts
+++ b/packages/ntcore-ts-client/src/lib/types/schemas.ts
@@ -225,7 +225,7 @@ export const msgPackValueSchema = z.union([
 /** Schema for a binary message in the msgpack format. */
 export const msgPackSchema = z.tuple([
   z.union([z.number().int().nonnegative(), z.literal(-1)]),
-  z.number().int().nonnegative(),
+  z.number().int(),
   typeNumSchema,
   msgPackValueSchema,
 ]);