diff --git a/programs/openbook-v2/src/accounts_ix/close_open_orders_account.rs b/programs/openbook-v2/src/accounts_ix/close_open_orders_account.rs
index bf5646bb5..8f8df6db8 100644
--- a/programs/openbook-v2/src/accounts_ix/close_open_orders_account.rs
+++ b/programs/openbook-v2/src/accounts_ix/close_open_orders_account.rs
@@ -3,8 +3,6 @@ use anchor_lang::prelude::*;
 
 #[derive(Accounts)]
 pub struct CloseOpenOrdersAccount<'info> {
-    #[account(mut)]
-    pub payer: Signer<'info>,
     pub owner: Signer<'info>,
     #[account(
         mut,
diff --git a/programs/openbook-v2/src/accounts_ix/place_order.rs b/programs/openbook-v2/src/accounts_ix/place_order.rs
index 35f3e254a..8647c6589 100644
--- a/programs/openbook-v2/src/accounts_ix/place_order.rs
+++ b/programs/openbook-v2/src/accounts_ix/place_order.rs
@@ -40,6 +40,7 @@ pub struct PlaceOrder<'info> {
     pub event_heap: AccountLoader<'info, EventHeap>,
     #[account(
         mut,
+        // The side of the vault is checked inside the ix
         constraint = market.load()?.is_market_vault(market_vault.key())
     )]
     pub market_vault: Account<'info, TokenAccount>,
diff --git a/programs/openbook-v2/tests/cases/test_indexer.rs b/programs/openbook-v2/tests/cases/test_indexer.rs
index e2312e94f..7a046eaa8 100644
--- a/programs/openbook-v2/tests/cases/test_indexer.rs
+++ b/programs/openbook-v2/tests/cases/test_indexer.rs
@@ -69,7 +69,6 @@ async fn test_indexer() -> Result<(), TransportError> {
             account_num: 2,
             market,
             owner,
-            payer,
             sol_destination: owner.pubkey(),
         },
     )
diff --git a/programs/openbook-v2/tests/program_test/client.rs b/programs/openbook-v2/tests/program_test/client.rs
index 4cce1ba08..7c11dcaa9 100644
--- a/programs/openbook-v2/tests/program_test/client.rs
+++ b/programs/openbook-v2/tests/program_test/client.rs
@@ -229,7 +229,6 @@ pub struct CloseOpenOrdersAccountInstruction {
     pub account_num: u32,
     pub market: Pubkey,
     pub owner: TestKeypair,
-    pub payer: TestKeypair,
     pub sol_destination: Pubkey,
 }
 #[async_trait::async_trait(?Send)]
@@ -261,7 +260,6 @@ impl ClientInstruction for CloseOpenOrdersAccountInstruction {
 
         let accounts = openbook_v2::accounts::CloseOpenOrdersAccount {
             owner: self.owner.pubkey(),
-            payer: self.payer.pubkey(),
             open_orders_indexer,
             open_orders_account,
             sol_destination: self.sol_destination,
diff --git a/ts/client/src/client.ts b/ts/client/src/client.ts
index a61293996..f45ce332c 100644
--- a/ts/client/src/client.ts
+++ b/ts/client/src/client.ts
@@ -910,10 +910,8 @@ export class OpenBookV2Client {
   }
 
   public async closeOpenOrdersAccountIx(
-    payer: Keypair,
     owner: Keypair = payer,
     openOrdersPublicKey: PublicKey,
-    market: MarketAccount,
     solDestination: PublicKey = this.walletPk,
     openOrdersIndexer?: PublicKey,
   ): Promise<[TransactionInstruction, Signer[]]> {
@@ -924,7 +922,6 @@ export class OpenBookV2Client {
       const ix = await this.program.methods
         .closeOpenOrdersAccount()
         .accounts({
-          payer: payer.publicKey,
           owner: owner.publicKey,
           openOrdersIndexer,
           openOrdersAccount: openOrdersPublicKey,