diff --git a/__tests__/fixtures/services.ts b/__tests__/fixtures/services.ts
index a2f346da..5584be68 100644
--- a/__tests__/fixtures/services.ts
+++ b/__tests__/fixtures/services.ts
@@ -136,12 +136,10 @@ export const FallibleServiceConstructor = () =>
         throwError: Type.Boolean(),
       }),
       output: Type.Object({ response: Type.String() }),
-      errors: Type.Union([
-        Type.Object({
-          code: Type.Literal(STREAM_ERROR),
-          message: Type.String(),
-        }),
-      ]),
+      errors: Type.Object({
+        code: Type.Literal(STREAM_ERROR),
+        message: Type.String(),
+      }),
       async handler(_ctx, msgStream, returnStream) {
         for await (const { msg, throwError, throwResult } of msgStream) {
           if (throwError) {
diff --git a/package-lock.json b/package-lock.json
index 8770b491..6903d98e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@replit/river",
-  "version": "0.10.2",
+  "version": "0.10.3",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@replit/river",
-      "version": "0.10.2",
+      "version": "0.10.3",
       "license": "MIT",
       "dependencies": {
         "@msgpack/msgpack": "^3.0.0-beta2",
diff --git a/package.json b/package.json
index e3178853..aeed1507 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@replit/river",
   "description": "It's like tRPC but... with JSON Schema Support, duplex streaming and support for service multiplexing. Transport agnostic!",
-  "version": "0.10.2",
+  "version": "0.10.3",
   "type": "module",
   "exports": {
     ".": {
diff --git a/router/result.ts b/router/result.ts
index e20f094b..1d9e2fe1 100644
--- a/router/result.ts
+++ b/router/result.ts
@@ -10,11 +10,11 @@ import {
 
 export type RiverErrorSchema =
   | TObject<{
-      code: TLiteralString;
+      code: TLiteralString | TUnion<TLiteralString[]>;
       message: TLiteralString | TString;
     }>
   | TObject<{
-      code: TLiteralString;
+      code: TLiteralString | TUnion<TLiteralString[]>;
       message: TLiteralString | TString;
       extras: TSchema;
     }>;