diff --git a/packages/cosmwasm/src/cw3cosmwasmclient.ts b/packages/cosmwasm/src/cw3cosmwasmclient.ts
index 933c9574..15f74941 100644
--- a/packages/cosmwasm/src/cw3cosmwasmclient.ts
+++ b/packages/cosmwasm/src/cw3cosmwasmclient.ts
@@ -4,14 +4,7 @@ import { BroadcastMode, GasLimits, GasPrice, OfflineSigner } from "@cosmjs/launc
 import { CosmosMsg } from "./cosmosmsg";
 import { Account } from "./cosmwasmclient";
 import { CosmWasmFeeTable, ExecuteResult, SigningCosmWasmClient } from "./signingcosmwasmclient";
-
-export type Expiration =
-  | {
-      readonly at_height: number;
-    }
-  | {
-      readonly at_time: number;
-    };
+import { Expiration } from "./types";
 
 export enum Vote {
   Yes = "yes",
diff --git a/packages/cosmwasm/src/index.ts b/packages/cosmwasm/src/index.ts
index 88cc32d0..a9151c7d 100644
--- a/packages/cosmwasm/src/index.ts
+++ b/packages/cosmwasm/src/index.ts
@@ -20,7 +20,6 @@ export {
 export { Cw1CosmWasmClient } from "./cw1cosmwasmclient";
 export {
   Cw3CosmWasmClient,
-  Expiration,
   ProposalResult,
   ProposalsResult,
   ThresholdResult,
@@ -54,3 +53,4 @@ export {
   MsgUpdateAdmin,
   MsgStoreCode,
 } from "./msgs";
+export { Expiration } from "./types";
diff --git a/packages/cosmwasm/src/types.ts b/packages/cosmwasm/src/types.ts
index bba7fc95..0d0ba0ba 100644
--- a/packages/cosmwasm/src/types.ts
+++ b/packages/cosmwasm/src/types.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/naming-convention */
 import { fromBase64, fromHex } from "@cosmjs/encoding";
 
 export interface WasmData {
@@ -25,3 +26,14 @@ export function parseWasmData({ key, val }: WasmData): Model {
  * This doen't privide any type safety over `any` but expresses intent in the code.
  */
 export type JsonObject = any;
+
+export type Expiration =
+  | {
+      readonly at_height: number;
+    }
+  | {
+      readonly at_time: number;
+    }
+  | {
+      readonly never: Record<any, never>;
+    };
diff --git a/packages/cosmwasm/types/cw3cosmwasmclient.d.ts b/packages/cosmwasm/types/cw3cosmwasmclient.d.ts
index 80ff14fc..fdc96478 100644
--- a/packages/cosmwasm/types/cw3cosmwasmclient.d.ts
+++ b/packages/cosmwasm/types/cw3cosmwasmclient.d.ts
@@ -2,13 +2,7 @@ import { BroadcastMode, GasLimits, GasPrice, OfflineSigner } from "@cosmjs/launc
 import { CosmosMsg } from "./cosmosmsg";
 import { Account } from "./cosmwasmclient";
 import { CosmWasmFeeTable, ExecuteResult, SigningCosmWasmClient } from "./signingcosmwasmclient";
-export declare type Expiration =
-  | {
-      readonly at_height: number;
-    }
-  | {
-      readonly at_time: number;
-    };
+import { Expiration } from "./types";
 export declare enum Vote {
   Yes = "yes",
   No = "no",
diff --git a/packages/cosmwasm/types/index.d.ts b/packages/cosmwasm/types/index.d.ts
index 88cc32d0..a9151c7d 100644
--- a/packages/cosmwasm/types/index.d.ts
+++ b/packages/cosmwasm/types/index.d.ts
@@ -20,7 +20,6 @@ export {
 export { Cw1CosmWasmClient } from "./cw1cosmwasmclient";
 export {
   Cw3CosmWasmClient,
-  Expiration,
   ProposalResult,
   ProposalsResult,
   ThresholdResult,
@@ -54,3 +53,4 @@ export {
   MsgUpdateAdmin,
   MsgStoreCode,
 } from "./msgs";
+export { Expiration } from "./types";
diff --git a/packages/cosmwasm/types/types.d.ts b/packages/cosmwasm/types/types.d.ts
index 45d870c7..33928389 100644
--- a/packages/cosmwasm/types/types.d.ts
+++ b/packages/cosmwasm/types/types.d.ts
@@ -12,3 +12,13 @@ export declare function parseWasmData({ key, val }: WasmData): Model;
  * This doen't privide any type safety over `any` but expresses intent in the code.
  */
 export declare type JsonObject = any;
+export declare type Expiration =
+  | {
+      readonly at_height: number;
+    }
+  | {
+      readonly at_time: number;
+    }
+  | {
+      readonly never: Record<any, never>;
+    };