diff --git a/fuel-zkvm-primitives-utils/src/vm/contract.rs b/fuel-zkvm-primitives-utils/src/vm/contract.rs
index 2db9ec6..1af2f26 100644
--- a/fuel-zkvm-primitives-utils/src/vm/contract.rs
+++ b/fuel-zkvm-primitives-utils/src/vm/contract.rs
@@ -1,7 +1,6 @@
 use crate::vm::base::AsRepr;
-use fuel_core_types::fuel_asm::{op, GTFArgs, Instruction, RegId};
+use fuel_core_types::fuel_asm::{op, Instruction, RegId};
 use fuel_core_types::fuel_tx::Word;
-use fuel_core_types::fuel_types::bytes::WORD_SIZE;
 use fuel_core_types::fuel_types::Bytes32;
 use fuels::prelude::AssetId;
 use fuels::prelude::ContractId;
@@ -172,10 +171,9 @@ impl ContractInstruction {
 }
 
 fn bal() -> Vec<Instruction> {
-    let word_size = WORD_SIZE.try_into().unwrap();
     vec![
-        op::gtf_args(0x11, 0x00, GTFArgs::ScriptData),
-        op::addi(0x12, 0x11, word_size),
+        op::movi(0x11, 0),
+        op::addi(0x12, 0x11, AssetId::LEN.try_into().unwrap()),
         op::bal(0x10, 0x12, 0x11),
         op::jmpb(RegId::ZERO, 0),
     ]