diff --git a/crates/blockifier/src/execution/stack_trace.rs b/crates/blockifier/src/execution/stack_trace.rs
index 9380217e67..bce3b80862 100644
--- a/crates/blockifier/src/execution/stack_trace.rs
+++ b/crates/blockifier/src/execution/stack_trace.rs
@@ -207,8 +207,13 @@ pub fn extract_trailing_cairo1_revert_trace(root_call: &CallInfo) -> String {
         .iter()
         .map(|call_info| {
             format!(
-                "Error in contract (contract address: {:#064x}, selector: {:#064x}):",
+                "Error in contract (contract address: {:#064x}, class hash: {}, selector: \
+                 {:#064x}):",
                 call_info.call.storage_address.0.key(),
+                match call_info.call.class_hash {
+                    Some(class_hash) => format!("{:#064x}", class_hash.0),
+                    None => "_".to_string(),
+                },
                 call_info.call.entry_point_selector.0,
             )
         })
diff --git a/crates/blockifier/src/execution/stack_trace_test.rs b/crates/blockifier/src/execution/stack_trace_test.rs
index 7d5b8e1d20..d3a20f94d0 100644
--- a/crates/blockifier/src/execution/stack_trace_test.rs
+++ b/crates/blockifier/src/execution/stack_trace_test.rs
@@ -214,12 +214,12 @@ An ASSERT_EQ instruction failed: 1 != 0.
 0: Error in the called contract (contract address: {account_address_felt:#064x}, class hash: \
          {account_contract_hash:#064x}, selector: {execute_selector_felt:#064x}):
 Execution failed. Failure reason:
-Error in contract (contract address: {account_address_felt:#064x}, selector: \
-         {execute_selector_felt:#064x}):
-Error in contract (contract address: {test_contract_address_felt:#064x}, selector: \
-         {external_entry_point_selector_felt:#064x}):
-Error in contract (contract address: {test_contract_address_2_felt:#064x}, selector: \
-         {inner_entry_point_selector_felt:#064x}):
+Error in contract (contract address: {account_address_felt:#064x}, class hash: \
+         {account_contract_hash:#064x}, selector: {execute_selector_felt:#064x}):
+Error in contract (contract address: {test_contract_address_felt:#064x}, class hash: \
+         {test_contract_hash:#064x}, selector: {external_entry_point_selector_felt:#064x}):
+Error in contract (contract address: {test_contract_address_2_felt:#064x}, class hash: \
+         {test_contract_hash:#064x}, selector: {inner_entry_point_selector_felt:#064x}):
 0x6661696c ('fail').
 "
     );
@@ -337,12 +337,12 @@ Unknown location (pc=0:{expected_pc1})
 0: Error in the called contract (contract address: {account_address_felt:#064x}, class hash: \
                  {account_contract_hash:#064x}, selector: {execute_selector_felt:#064x}):
 Execution failed. Failure reason:
-Error in contract (contract address: {account_address_felt:#064x}, selector: \
-                 {execute_selector_felt:#064x}):
-Error in contract (contract address: {contract_address_felt:#064x}, selector: \
-                 {invoke_call_chain_selector_felt:#064x}):
-Error in contract (contract address: {contract_address_felt:#064x}, selector: \
-                 {invoke_call_chain_selector_felt:#064x}):
+Error in contract (contract address: {account_address_felt:#064x}, class hash: \
+                 {account_contract_hash:#064x}, selector: {execute_selector_felt:#064x}):
+Error in contract (contract address: {contract_address_felt:#064x}, class hash: \
+                 {test_contract_hash:#064x}, selector: {invoke_call_chain_selector_felt:#064x}):
+Error in contract (contract address: {contract_address_felt:#064x}, class hash: \
+                 {test_contract_hash:#064x}, selector: {invoke_call_chain_selector_felt:#064x}):
 {expected_error}.
 "
             )
@@ -490,14 +490,14 @@ Unknown location (pc=0:{expected_pc3})
 0: Error in the called contract (contract address: {account_address_felt:#064x}, class hash: \
                  {account_contract_hash:#064x}, selector: {execute_selector_felt:#064x}):
 Execution failed. Failure reason:
-Error in contract (contract address: {account_address_felt:#064x}, selector: \
-                 {execute_selector_felt:#064x}):
-Error in contract (contract address: {address_felt:#064x}, selector: \
-                 {invoke_call_chain_selector_felt:#064x}):
-Error in contract (contract address: {address_felt:#064x}, selector: \
-                 {invoke_call_chain_selector_felt:#064x}):
-Error in contract (contract address: {address_felt:#064x}, selector: \
-                 {last_func_selector_felt:#064x}):
+Error in contract (contract address: {account_address_felt:#064x}, class hash: \
+                 {account_contract_hash:#064x}, selector: {execute_selector_felt:#064x}):
+Error in contract (contract address: {address_felt:#064x}, class hash: {test_contract_hash:#064x}, \
+                 selector: {invoke_call_chain_selector_felt:#064x}):
+Error in contract (contract address: {address_felt:#064x}, class hash: {test_contract_hash:#064x}, \
+                 selector: {invoke_call_chain_selector_felt:#064x}):
+Error in contract (contract address: {address_felt:#064x}, class hash: {test_contract_hash:#064x}, \
+                 selector: {last_func_selector_felt:#064x}):
 {expected_error}.
 "
             )
@@ -597,8 +597,10 @@ An ASSERT_EQ instruction failed: 1 != 0.
         ),
         CairoVersion::Cairo1 => format!(
             "The `validate` entry point panicked with:
-Error in contract (contract address: {contract_address:#064x}, selector: {selector:#064x}):
-0x496e76616c6964207363656e6172696f ('Invalid scenario')."
+Error in contract (contract address: {contract_address:#064x}, class hash: {:#064x}, selector: \
+             {selector:#064x}):
+0x496e76616c6964207363656e6172696f ('Invalid scenario').",
+            class_hash.0
         ),
     };
 
@@ -665,10 +667,11 @@ An ASSERT_EQ instruction failed: 1 != 0.
             .to_string(),
             CairoVersion::Cairo1 => format!(
                 "Execution failed. Failure reason:
-Error in contract (contract address: {expected_address:#064x}, selector: \
+Error in contract (contract address: {expected_address:#064x}, class hash: {:#064x}, selector: \
                  {expected_selector:#064x}):
 0x496e76616c6964207363656e6172696f ('Invalid scenario').
-"
+",
+                class_hash.0
             )
             .to_string(),
         };
@@ -798,11 +801,13 @@ Error at pc=0:{}:
 Error at pc=0:{}:
 {frame_2}
 Execution failed. Failure reason:
-Error in contract (contract address: {expected_address:#064x}, selector: {:#064x}):
+Error in contract (contract address: {expected_address:#064x}, class hash: {:#064x}, selector: \
+                 {:#064x}):
 0x496e76616c6964207363656e6172696f ('Invalid scenario').
 ",
                 execute_offset + 205,
                 deploy_offset + 194,
+                faulty_class_hash.0,
                 ctor_selector.0
             )
         }
diff --git a/crates/blockifier/src/execution/syscalls/syscall_tests/failure_format.rs b/crates/blockifier/src/execution/syscalls/syscall_tests/failure_format.rs
index ccb823cf1e..aed94c351f 100644
--- a/crates/blockifier/src/execution/syscalls/syscall_tests/failure_format.rs
+++ b/crates/blockifier/src/execution/syscalls/syscall_tests/failure_format.rs
@@ -20,7 +20,7 @@ fn test_syscall_failure_format() {
         error.to_string(),
         format!(
             "Execution failed. Failure reason:
-Error in contract (contract address: {:#064x}, selector: {:#064x}):
+Error in contract (contract address: {:#064x}, class hash: _, selector: {:#064x}):
 {execution_failure} ('Execution failure').",
             ContractAddress::default().0.key(),
             EntryPointSelector::default().0