diff --git a/crates/blockifier/src/execution/contract_class.rs b/crates/blockifier/src/execution/contract_class.rs
index 48ec3d607e..5288fd63e3 100644
--- a/crates/blockifier/src/execution/contract_class.rs
+++ b/crates/blockifier/src/execution/contract_class.rs
@@ -11,7 +11,7 @@ use cairo_lang_starknet_classes::contract_class::{
     ContractEntryPoint as SierraContractEntryPoint,
 };
 use cairo_lang_starknet_classes::NestedIntList;
-use cairo_lang_utils::bigint::BigUintAsHex;
+// use cairo_lang_utils::bigint::BigUintAsHex;
 #[allow(unused_imports)]
 use cairo_native::executor::AotNativeExecutor;
 use cairo_vm::serde::deserialize_program::{
@@ -631,8 +631,7 @@ impl NativeContractClassV1 {
 pub struct NativeContractClassV1Inner {
     pub executor: AotNativeExecutor,
     entry_points_by_type: EntryPointsByType<NativeEntryPoint>,
-    // Storing the raw sierra program and entry points to be able to compare the contract class.
-    sierra_program: Vec<BigUintAsHex>,
+    casm: Option<starknet_api::contract_class::ContractClass>,
 }
 
 impl NativeContractClassV1Inner {
@@ -640,7 +639,7 @@ impl NativeContractClassV1Inner {
         NativeContractClassV1Inner {
             executor,
             entry_points_by_type: EntryPointsByType::from(&sierra_contract_class),
-            sierra_program: sierra_contract_class.sierra_program,
+            casm: None,
         }
     }
 }
@@ -649,8 +648,7 @@ impl NativeContractClassV1Inner {
 // be the same therefore we exclude it from the comparison.
 impl PartialEq for NativeContractClassV1Inner {
     fn eq(&self, other: &Self) -> bool {
-        self.entry_points_by_type == other.entry_points_by_type
-            && self.sierra_program == other.sierra_program
+        self.entry_points_by_type == other.entry_points_by_type && self.casm == other.casm
     }
 }