diff --git a/program/src/poseidon_merkle_tree/processor.rs b/program/src/poseidon_merkle_tree/processor.rs
index c5cabaf07a..741d4ae0d9 100644
--- a/program/src/poseidon_merkle_tree/processor.rs
+++ b/program/src/poseidon_merkle_tree/processor.rs
@@ -122,7 +122,7 @@ impl<'a, 'b> MerkleTreeProcessor<'a, 'b> {
                 self.program_id,
             )?;
             pubkey_check(
-                *signer.key,
+                *_tmp_storage_pda.key,
                 solana_program::pubkey::Pubkey::new(&merkle_tree_pda_data.pubkey_locked),
                 String::from("Merkle tree locked by another account."),
             )?;
@@ -156,7 +156,7 @@ impl<'a, 'b> MerkleTreeProcessor<'a, 'b> {
                 || merkle_tree_pda_data.time_locked + LOCK_DURATION < current_slot
             {
                 merkle_tree_pda_data.time_locked = <Clock as Sysvar>::get()?.slot;
-                merkle_tree_pda_data.pubkey_locked = signer.key.to_bytes().to_vec();
+                merkle_tree_pda_data.pubkey_locked = _tmp_storage_pda.key.to_bytes().to_vec();
                 msg!("Locked at slot: {}", merkle_tree_pda_data.time_locked);
                 msg!(
                     "Locked by: {:?}",
@@ -218,7 +218,7 @@ impl<'a, 'b> MerkleTreeProcessor<'a, 'b> {
 
             //checking if signer locked
             pubkey_check(
-                *signer.key,
+                *_tmp_storage_pda.key,
                 solana_program::pubkey::Pubkey::new(&merkle_tree_pda_data.pubkey_locked),
                 String::from("Merkle tree locked by other account."),
             )?;
diff --git a/program/tests/onchain.rs b/program/tests/onchain.rs
index dafe7b81eb..9c8ae44323 100644
--- a/program/tests/onchain.rs
+++ b/program/tests/onchain.rs
@@ -284,7 +284,7 @@ pub async fn update_merkle_tree(
 ) {
     let mut i = 0;
     let mut cache_index = 1267;
-    
+
     for instruction_id in 0..236 {
         //checking merkle tree lock
         if instruction_id != 0 {
@@ -298,7 +298,7 @@ pub async fn update_merkle_tree(
                 MerkleTree::unpack(&merkle_tree_pda_account.data.clone()).unwrap();
             assert_eq!(
                 Pubkey::new(&merkle_tree_pda_account_data.pubkey_locked[..]),
-                signer_keypair.pubkey()
+                *tmp_storage_pda_pubkey
             );
             let tmp_storage_pda_account = program_context
                 .banks_client