diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1570e865e..4371a32a4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,16 @@
 
 ## Version 10
 
+### v10.3.1
+
+- Fixed issue of the insufficient exports of the proprietary schema definitions.
+  - The issue introduced in version 10.0.0-beta1 due to changing the compiler to `tsup`.
+  - The issue manifested only when `declaration` is enabled in your `tsconfig.json`.
+  - The issue caused following error:
+    - `TS4023: Exported variable '' has or is using name 'ZodFileDef' from external module "" but cannot be named.`
+  - The following interfaces are now available within the exported `ez` namespace:
+    - `ez.ZodFileDef`, `ez.ZodUploadDef`, `ez.ZodDateInDef`, `ez.ZodDateOutDef`.
+
 ### v10.3.0
 
 - Feature #945 for a client generator, proposed by [@McMerph](https://github.com/McMerph).
diff --git a/src/ez-namespace.ts b/src/ez-namespace.ts
deleted file mode 100644
index 204917dcd..000000000
--- a/src/ez-namespace.ts
+++ /dev/null
@@ -1,17 +0,0 @@
-import { ZodDateIn, ZodDateInDef } from "./date-in-schema";
-import { ZodDateOut, ZodDateOutDef } from "./date-out-schema";
-import { ZodFile, ZodFileDef } from "./file-schema";
-import { ZodUpload, ZodUploadDef } from "./upload-schema";
-
-export namespace ez {
-  export const file = ZodFile.create;
-  export const upload = ZodUpload.create;
-  export const dateIn = ZodDateIn.create;
-  export const dateOut = ZodDateOut.create;
-}
-
-export type ProprietaryKinds =
-  | ZodFileDef["typeName"]
-  | ZodUploadDef["typeName"]
-  | ZodDateInDef["typeName"]
-  | ZodDateOutDef["typeName"];
diff --git a/src/index.ts b/src/index.ts
index 8a10130ac..54e248cf8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -26,7 +26,7 @@ export {
 export { withMeta } from "./metadata";
 export { testEndpoint } from "./mock";
 export { Client } from "./client";
-export { ez } from "./ez-namespace";
+export * as ez from "./proprietary-schemas";
 
 import createHttpError from "http-errors";
 export { createHttpError };
diff --git a/src/proprietary-schemas.ts b/src/proprietary-schemas.ts
new file mode 100644
index 000000000..d89b67189
--- /dev/null
+++ b/src/proprietary-schemas.ts
@@ -0,0 +1,14 @@
+import { ZodDateIn } from "./date-in-schema";
+import { ZodDateOut } from "./date-out-schema";
+import { ZodFile } from "./file-schema";
+import { ZodUpload } from "./upload-schema";
+
+export type { ZodDateInDef } from "./date-in-schema";
+export type { ZodDateOutDef } from "./date-out-schema";
+export type { ZodFileDef } from "./file-schema";
+export type { ZodUploadDef } from "./upload-schema";
+
+export const file = ZodFile.create;
+export const upload = ZodUpload.create;
+export const dateIn = ZodDateIn.create;
+export const dateOut = ZodDateOut.create;
diff --git a/src/schema-walker.ts b/src/schema-walker.ts
index be9fc73a3..6e0cb0f75 100644
--- a/src/schema-walker.ts
+++ b/src/schema-walker.ts
@@ -1,5 +1,10 @@
 import { z } from "zod";
-import { ProprietaryKinds } from "./ez-namespace";
+import {
+  ZodDateInDef,
+  ZodDateOutDef,
+  ZodFileDef,
+  ZodUploadDef,
+} from "./proprietary-schemas";
 
 export type HandlingVariant = "last" | "regular" | "each";
 
@@ -29,6 +34,12 @@ export type SchemaHandler<
   Variant extends HandlingVariant = "regular"
 > = (params: SchemaHandlingProps<T, U, Context, Variant>) => U;
 
+export type ProprietaryKinds =
+  | ZodFileDef["typeName"]
+  | ZodUploadDef["typeName"]
+  | ZodDateInDef["typeName"]
+  | ZodDateOutDef["typeName"];
+
 export type HandlingRules<U, Context extends object = {}> = Partial<
   Record<
     z.ZodFirstPartyTypeKind | ProprietaryKinds,