diff --git a/CHANGELOG.md b/CHANGELOG.md
index a08898a6..3e20e236 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -59,11 +59,14 @@ and this project adheres to
   `number` to `bigint` as those values can exceed the safe integer range
   ([#1133]).
 - @cosmjs/stargate: Remove Cosmos SDK 0.42 support ([#1094]).
+- @cosmjs/tendermint-rpc: Change spelling of field `codeSpace` to `codespace` in
+  `TxData` and `BroadcastTxSyncResponse` ([#1234]).
 
 [#1131]: https://github.com/cosmos/cosmjs/pull/1131
 [#1168]: https://github.com/cosmos/cosmjs/pull/1168
 [#1133]: https://github.com/cosmos/cosmjs/issues/1133
 [#1094]: https://github.com/cosmos/cosmjs/issues/1094
+[#1234]: https://github.com/cosmos/cosmjs/issues/1234
 
 ## [0.28.11] - 2022-07-13
 
diff --git a/packages/cosmwasm-stargate/src/cosmwasmclient.ts b/packages/cosmwasm-stargate/src/cosmwasmclient.ts
index 433d939f..41dd31fb 100644
--- a/packages/cosmwasm-stargate/src/cosmwasmclient.ts
+++ b/packages/cosmwasm-stargate/src/cosmwasmclient.ts
@@ -292,7 +292,7 @@ export class CosmWasmClient {
     const broadcasted = await this.forceGetTmClient().broadcastTxSync({ tx });
     if (broadcasted.code) {
       return Promise.reject(
-        new BroadcastTxError(broadcasted.code, broadcasted.codeSpace ?? "", broadcasted.log),
+        new BroadcastTxError(broadcasted.code, broadcasted.codespace ?? "", broadcasted.log),
       );
     }
     const transactionId = toHex(broadcasted.hash).toUpperCase();
diff --git a/packages/stargate/src/stargateclient.ts b/packages/stargate/src/stargateclient.ts
index 8a3888db..b41f5650 100644
--- a/packages/stargate/src/stargateclient.ts
+++ b/packages/stargate/src/stargateclient.ts
@@ -428,7 +428,7 @@ export class StargateClient {
     const broadcasted = await this.forceGetTmClient().broadcastTxSync({ tx });
     if (broadcasted.code) {
       return Promise.reject(
-        new BroadcastTxError(broadcasted.code, broadcasted.codeSpace ?? "", broadcasted.log),
+        new BroadcastTxError(broadcasted.code, broadcasted.codespace ?? "", broadcasted.log),
       );
     }
     const transactionId = toHex(broadcasted.hash).toUpperCase();
diff --git a/packages/tendermint-rpc/src/tendermint34/adaptor/responses.ts b/packages/tendermint-rpc/src/tendermint34/adaptor/responses.ts
index e5222944..bfbf5553 100644
--- a/packages/tendermint-rpc/src/tendermint34/adaptor/responses.ts
+++ b/packages/tendermint-rpc/src/tendermint34/adaptor/responses.ts
@@ -154,7 +154,7 @@ interface RpcTxData {
 function decodeTxData(data: RpcTxData): responses.TxData {
   return {
     code: apiToSmallInt(assertNumber(data.code ?? 0)),
-    codeSpace: data.codespace,
+    codespace: data.codespace,
     log: data.log,
     data: may(fromBase64, data.data),
     events: data.events ? decodeEvents(data.events) : [],
diff --git a/packages/tendermint-rpc/src/tendermint34/responses.ts b/packages/tendermint-rpc/src/tendermint34/responses.ts
index 70a3516f..a5bc00fb 100644
--- a/packages/tendermint-rpc/src/tendermint34/responses.ts
+++ b/packages/tendermint-rpc/src/tendermint34/responses.ts
@@ -194,7 +194,7 @@ export interface Event {
 
 export interface TxData {
   readonly code: number;
-  readonly codeSpace?: string;
+  readonly codespace?: string;
   readonly log?: string;
   readonly data?: Uint8Array;
   readonly events: readonly Event[];
diff --git a/packages/tendermint-rpc/src/tendermint34/tendermint34client.spec.ts b/packages/tendermint-rpc/src/tendermint34/tendermint34client.spec.ts
index 679af228..1daa834f 100644
--- a/packages/tendermint-rpc/src/tendermint34/tendermint34client.spec.ts
+++ b/packages/tendermint-rpc/src/tendermint34/tendermint34client.spec.ts
@@ -77,7 +77,7 @@ function defaultTestSuite(rpcFactory: () => RpcClient, expected: ExpectedValues)
       expect(response.hash.length).toEqual(32);
       // verify success
       expect(response.code).toBeFalsy();
-      expect(response.codeSpace).toBeFalsy();
+      expect(response.codespace).toBeFalsy();
 
       client.disconnect();
     });
diff --git a/packages/tendermint-rpc/src/tendermint35/adaptor/responses.ts b/packages/tendermint-rpc/src/tendermint35/adaptor/responses.ts
index 30aad6ef..6346a942 100644
--- a/packages/tendermint-rpc/src/tendermint35/adaptor/responses.ts
+++ b/packages/tendermint-rpc/src/tendermint35/adaptor/responses.ts
@@ -155,7 +155,7 @@ interface RpcTxData {
 function decodeTxData(data: RpcTxData): responses.TxData {
   return {
     code: apiToSmallInt(assertNumber(data.code ?? 0)),
-    codeSpace: data.codespace,
+    codespace: data.codespace,
     log: data.log,
     data: may(fromBase64, data.data),
     events: data.events ? decodeEvents(data.events) : [],
diff --git a/packages/tendermint-rpc/src/tendermint35/responses.ts b/packages/tendermint-rpc/src/tendermint35/responses.ts
index 7440d8d9..07313261 100644
--- a/packages/tendermint-rpc/src/tendermint35/responses.ts
+++ b/packages/tendermint-rpc/src/tendermint35/responses.ts
@@ -199,7 +199,7 @@ export interface Event {
 
 export interface TxData {
   readonly code: number;
-  readonly codeSpace?: string;
+  readonly codespace?: string;
   readonly log?: string;
   readonly data?: Uint8Array;
   readonly events: readonly Event[];
diff --git a/packages/tendermint-rpc/src/tendermint35/tendermint35client.spec.ts b/packages/tendermint-rpc/src/tendermint35/tendermint35client.spec.ts
index 8a63d3c7..d46b95cc 100644
--- a/packages/tendermint-rpc/src/tendermint35/tendermint35client.spec.ts
+++ b/packages/tendermint-rpc/src/tendermint35/tendermint35client.spec.ts
@@ -77,7 +77,7 @@ function defaultTestSuite(rpcFactory: () => RpcClient, expected: ExpectedValues)
       expect(response.hash.length).toEqual(32);
       // verify success
       expect(response.code).toBeFalsy();
-      expect(response.codeSpace).toBeFalsy();
+      expect(response.codespace).toBeFalsy();
 
       client.disconnect();
     });