diff --git a/zod-plugin/src/augmentation.ts b/zod-plugin/src/augmentation.ts
index 0eeac16fba..343d00d664 100644
--- a/zod-plugin/src/augmentation.ts
+++ b/zod-plugin/src/augmentation.ts
@@ -6,7 +6,7 @@ declare module "zod/v4/core" {
   interface GlobalMeta {
     default?: unknown; // can be an actual value or a label like "Today"
     examples?: unknown[]; // see zod commit ee5615d
-    [brandProperty]?: symbol | string | number;
+    [brandProperty]?: PropertyKey;
   }
 }
 
diff --git a/zod-plugin/tests/index.spec.ts b/zod-plugin/tests/index.spec.ts
index aa296ec7f7..ad61a3347e 100644
--- a/zod-plugin/tests/index.spec.ts
+++ b/zod-plugin/tests/index.spec.ts
@@ -3,6 +3,9 @@ import * as entrypoint from "../src";
 
 describe("Entrypoint", () => {
   test("Augmentation", () => {
+    expectTypeOf<z.ZodAny>()
+      .toHaveProperty("xBrand")
+      .toEqualTypeOf<(brand?: PropertyKey) => z.ZodAny>();
     expectTypeOf<z.ZodAny>()
       .toHaveProperty("example")
       .toEqualTypeOf<(value: any) => z.ZodAny>();
@@ -24,7 +27,7 @@ describe("Entrypoint", () => {
     expectTypeOf<ReturnType<typeof globalRegistry.get>>()
       .exclude(undefined)
       .toHaveProperty("x-brand")
-      .toEqualTypeOf<symbol | string | number | undefined>();
+      .toEqualTypeOf<PropertyKey | undefined>();
   });
 
   test("has no exports", () => {